SETUP AN INTERRUPT IN 16f690

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c36041254

Member
Hi there ! I'm learning how to setup interrupts in PICs from
Tutorial 11
but, this is for 16f84 and I have f690, so far this is what I have done, almost copy of what is on the site, if you can guide me how interrupts work for 16f690 than Ill be thankful

Code:
list p=16f690
#include <p16f690.inc>
__CONFIG	-_MCLRE_ON & _CP_OFF & _WDT_OFF & _INTRC_OSC_NOCLKOUT
ERRORLEVEL	-302

UDATA
temp	RES 1
display RES 1
count   RES 1
;**************************STEUP THE CONSTANTS*******************************

org 0x05	;this is where we come on power up and reset

;**************************INTRUPT ROUTINE************************************

movwf temp			;this and the lable Loop will run simultenously
;move w into f in case to there was someting in
;count(see first step of Loop)

incf  count,f		;increase count by 1 and put result in count
movlw .10			;load w with decimal 10
subwf count,w		;subtract count from w and place result in w
btfss STATUS,C		;if in above operation count<= w then carry bit
;is set, so check for that and skip next step
;if it is set
goto carry_on
goto clear

carry_on:
bcf INTCON,0x01     ;clear the INTF, just in case(read tuto. 11)
movfw temp			;move temp to w
retfie 				;get out of intrupt loop (this will start over
; the whole INTRUPT LOOP again
clear:
clrf count			;set count to 0
bcf INTCON,0x01		;clear INTF
retfie
;*****************************MAIN PROGRAMME************************
Main:

;*****************************SET UP THE INTRUP REGISTERS***********

bsf INTCON,0x07		; set globel intrupt (tell PIC that we will use intrupts)
bsf INTCON,0x04		;
bcf INTCON,0x01

;******************************SET UP THE PORTS**********************
bsf STATUS,RP0
movlw b'10000000'
movwf TRISC
bcf STATUS,RP0
;******************************NOW SEND THE VALUE OF COUNT TO PORTC**

Loop:
movf count,w
movwf PORTC
goto Loop
END

What I don't understand is that how PIC can know (in tutorial not in my code) that INTCON,4 will enable RB0 while 4 can be for PORTA also, is this because we have enable globle interrupt ?

Last edited:

blueroomelectronics

Well-Known Member
I don't have a 16F690 handy but I cobbled together this so you could run it through the MPLAB simulator. Should be easy to make it work with your interrupt based version.

Code:
        list p=16f690
#include <p16f690.inc>
__CONFIG    _WDT_OFF & _INTRC_OSC_NOCLKOUT
cblock  0x20
count
endc
Wtemp    equ     0x70    ; all bank RAM
org     0x00    ; this is where we come on power up and reset
goto    Init
;**************************INTRUPT ROUTINE************************************
org     0x04
IRQ    movwf   Wtemp    ; save W
incf    count,f  ;increase count by 1 and put result in count
movlw   .10
subwf   count,w  ;subtract count from w and place result in w
btfsc   STATUS,C ;if in above operation count<= w then carry bit
clrf    count
movf    count,W
movwf   PORTC    ; display W on PORTC
movf    Wtemp,W  ; restore W
bcf     INTCON,INTF
return
Init    bsf     STATUS,RP0      ;b1
movlw   b'10000000'
movwf   TRISC
bcf     STATUS,RP0      ;b0
clrf    count           ; count = 0
bsf     INTCON,T0IE
bcf     INTCON,INTF
bsf     INTCON,GIE

Main    call    IRQ       ; wait till next interrupt
goto    Main
END

c36041254

Member

Sorry, but I'm unable to understand your codes, what I make out of it is that it uses an internal interrupt timer 0 and whenever interrupt occur (bsf TOIE) it goes to IRQ but, i don't get how it automatically goes to IRQ and if it does do by call IRQ then how it can be called differrent from normal (interrupt less) codes, please explain me step by step so I can understand how actually codes suddenly switch to interrupt loop.
Oh ! and why the nuber increases by 4 on port c it should be incresed by 1, I mean that is what incf does.

Last edited:

Pommie

Well-Known Member
You seem a little confused with interrupts. When an interrupt occurs, the code stops what it is doing and jumps to location 4. It executes the code at that location until it meets a retfie (Return from interrupt) instruction and then returns to where it was before the instruction.

Bit 4 of INTCON enables the GP2 interrupt. This interrupt happens whenever GP2 goes from 0 to 1.
Bit 3 enables the GPIE. This interrupt happens whenever any GPIO pin changes.

Also, your code states, "org 0x05 ;this is where we come on power up and reset" - this is wrong. At reset or power up the processor goes to location zero. It is normal to put a goto at zero to jump over the interrupt code.

Mike.

c36041254

Member
Forget about my codes I don't understand what "blueroomelectronics " codes mean(scrool up).what I make out of it is that it uses an internal interrupt timer 0 and whenever interrupt occur (bsf TOIE) it goes to IRQ but, i don't get how it automatically goes to IRQ and if it does do by call IRQ then how it can be called differrent from normal (interrupt less) codes, please explain me step by step so I can understand how actually codes suddenly switch to interrupt loop.Oh ! and why the number increases by 4 on port c it should be incresed by 1, I mean that is what incf does, and when I write "org 0x04" where it is in blueroomelectronics's codes I have the error:

Error - section '.org_1' can not fit the absolute section. Section '.org_1' start=0x00000004, length=0x0000002a

changing "org 0x05" fixes this problem (don't know why, may be because the linker has vectors in 0x00 to 0x04, agin don't know what are the vectors are and why it is used for, I did read some MPLAB help file on it). And yes I do understand what an interrupt is, but should that alway start with 0x04? what if two or more interrupts are there?

Pommie

Well-Known Member
Code:
		list	p=16f690
#include <p16f690.inc>
__CONFIG -_MCLRE_ON & _CP_OFF & _WDT_OFF & _INTRC_OSC_NOCLKOUT
ERRORLEVEL -302

[COLOR="Blue"]cblock	0x20[/COLOR]
temp	RES 1
display	RES 1
count	RES 1
[COLOR="blue"]endc[/COLOR]

;**************************STEUP THE CONSTANTS*******************************

[COLOR="Blue"]org	0x0 [/COLOR]		;this is where we come on power up and reset
[COLOR="blue"]goto	Main[/COLOR]

;**************************INTRUPT ROUTINE************************************

[COLOR="blue"]org	0x04[/COLOR]

movwf	temp   		;this and the lable Loop will run simultenously
;move w into f in case to there was someting in
;count(see first step of Loop)

incf	count,f  	;increase count by 1 and put result in count
movlw	.10   		;load w with decimal 10
subwf	count,w  	;subtract count from w and place result in w
btfss	STATUS,C  	;if in above operation count<= w then carry bit
;is set, so check for that and skip next step
;if it is set
goto	carry_on
goto	clear

carry_on:
bcf	INTCON,0x01   	;clear the INTF, just in case(read tuto. 11)
movfw	temp   		;move temp to w
retfie			;get out of intrupt loop (this will start over
; the whole INTRUPT LOOP again
clear:
clrf	count   	;set count to 0
bcf	INTCON,0x01  	;clear INTF
retfie
;*****************************MAIN PROGRAMME************************
Main:

;*****************************SET UP THE INTRUP REGISTERS***********

bsf	INTCON,0x07  	; set globel intrupt (tell PIC that we will use intrupts)
bsf	INTCON,0x04  	;
bcf	INTCON,0x01

;******************************SET UP THE PORTS**********************
bsf	STATUS,RP0
movlw	b'10000000'
movwf	TRISC
bcf	STATUS,RP0
;******************************NOW SEND THE VALUE OF COUNT TO PORTC**

Loop:
movf	count,w
movwf	PORTC
goto	Loop
END

You should also read the data sheet about context saving in interrupts. (section 9.5)

Edit, forget Bill's code as well at the moment. It doesn't demonstrate interrupts at all and has just served to confuse you.

Mike.

c36041254

Member
Code:
		list	p=16f690
#include <p16f690.inc>
__CONFIG -_MCLRE_ON & _CP_OFF & _WDT_OFF & _INTRC_OSC_NOCLKOUT
ERRORLEVEL -302

[COLOR="Blue"]cblock	0x20[/COLOR]
temp	RES 1
display	RES 1
count	RES 1
[COLOR="blue"]endc[/COLOR]

;**************************STEUP THE CONSTANTS*******************************

[COLOR="Blue"]org	0x0 [/COLOR]		;this is where we come on power up and reset
[COLOR="blue"]goto	Main[/COLOR]

;**************************INTRUPT ROUTINE************************************

[COLOR="blue"]org	0x04[/COLOR]

movwf	temp   		;this and the lable Loop will run simultenously
;move w into f in case to there was someting in
;count(see first step of Loop)

incf	count,f  	;increase count by 1 and put result in count
movlw	.10   		;load w with decimal 10
subwf	count,w  	;subtract count from w and place result in w
btfss	STATUS,C  	;if in above operation count<= w then carry bit
;is set, so check for that and skip next step
;if it is set
goto	carry_on
goto	clear

carry_on:
bcf	INTCON,0x01   	;clear the INTF, just in case(read tuto. 11)
movfw	temp   		;move temp to w
retfie			;get out of intrupt loop (this will start over
; the whole INTRUPT LOOP again
clear:
clrf	count   	;set count to 0
bcf	INTCON,0x01  	;clear INTF
retfie
;*****************************MAIN PROGRAMME************************
Main:

;*****************************SET UP THE INTRUP REGISTERS***********

bsf	INTCON,0x07  	; set globel intrupt (tell PIC that we will use intrupts)
bsf	INTCON,0x04  	;
bcf	INTCON,0x01

;******************************SET UP THE PORTS**********************
bsf	STATUS,RP0
movlw	b'10000000'
movwf	TRISC
bcf	STATUS,RP0
;******************************NOW SEND THE VALUE OF COUNT TO PORTC**

Loop:
movf	count,w
movwf	PORTC
goto	Loop
END

You should also read the data sheet about context saving in interrupts. (section 9.5)

Edit, forget Bill's code as well at the moment. It doesn't demonstrate interrupts at all and has just served to confuse you.

Mike.
yor idia of not using linker gives too many errors:

Error[121] C:\PROGRAM FILES\MICROCHIP\MPASM SUITE\TEMPLATE\OBJECT\16F690TMPO.ASM 57 : Illegal label (temp RES 1)
Error[121] C:\PROGRAM FILES\MICROCHIP\MPASM SUITE\TEMPLATE\OBJECT\16F690TMPO.ASM 58 : Illegal label (display RES 1)
Error[121] C:\PROGRAM FILES\MICROCHIP\MPASM SUITE\TEMPLATE\OBJECT\16F690TMPO.ASM 59 : Illegal label (count RES 1)
Error[113] C:\PROGRAM FILES\MICROCHIP\MPASM SUITE\TEMPLATE\OBJECT\16F690TMPO.ASM 71 : Symbol not previously defined (temp)
Error[113] C:\PROGRAM FILES\MICROCHIP\MPASM SUITE\TEMPLATE\OBJECT\16F690TMPO.ASM 75 : Symbol not previously defined (count)
Error[113] C:\PROGRAM FILES\MICROCHIP\MPASM SUITE\TEMPLATE\OBJECT\16F690TMPO.ASM 77 : Symbol not previously defined (count)
Error[113] C:\PROGRAM FILES\MICROCHIP\MPASM SUITE\TEMPLATE\OBJECT\16F690TMPO.ASM 86 : Symbol not previously defined (temp)
Error[113] C:\PROGRAM FILES\MICROCHIP\MPASM SUITE\TEMPLATE\OBJECT\16F690TMPO.ASM 90 : Symbol not previously defined (count)
Error[113] C:\PROGRAM FILES\MICROCHIP\MPASM SUITE\TEMPLATE\OBJECT\16F690TMPO.ASM 110 : Symbol not previously defined (count)
Halting build on first failure as requested.
BUILD FAILED: Sat May 17 14:31:17 2008

ericgibbs

Well-Known Member
hi c90,
Your code assembles OK on my system, had to REM out the 'RES' in cblock, otherwise its OK.
Are you sure about the paths for the assembler to the INC files etc.???.....16F690TMPO.ASM

Code:
		list	p=16f690
#include <p16f690.inc>
__CONFIG -_MCLRE_ON & _CP_OFF & _WDT_OFF & _INTRC_OSC_NOCLKOUT
ERRORLEVEL -302

cblock	0x20
temp	;;RES 1
display	;;RES 1
count	;;RES 1
endc

;**************************STEUP THE CONSTANTS*******************************

org	0x0 		;this is where we come on power up and reset
goto	Main

;**************************INTRUPT ROUTINE************************************

org	0x04

movwf	temp   		;this and the lable Loop will run simultenously
;move w into f in case to there was someting in
;count(see first step of Loop)

incf	count,f  	;increase count by 1 and put result in count
movlw	.10   		;load w with decimal 10
subwf	count,w  	;subtract count from w and place result in w
btfss	STATUS,C  	;if in above operation count<= w then carry bit
;is set, so check for that and skip next step
;if it is set
goto	carry_on
goto	clear

carry_on:
bcf	INTCON,0x01   	;clear the INTF, just in case(read tuto. 11)
movfw	temp   		;move temp to w
retfie			;get out of intrupt loop (this will start over
; the whole INTRUPT LOOP again
clear:
clrf	count   	;set count to 0
bcf	INTCON,0x01  	;clear INTF
retfie
;*****************************MAIN PROGRAMME************************
Main:

;*****************************SET UP THE INTRUP REGISTERS***********

bsf	INTCON,0x07  	; set globel intrupt (tell PIC that we will use intrupts)
bsf	INTCON,0x04  	;
bcf	INTCON,0x01

;******************************SET UP THE PORTS**********************
bsf	STATUS,RP0
movlw	b'10000000'
movwf	TRISC
bcf	STATUS,RP0
;******************************NOW SEND THE VALUE OF COUNT TO PORTC**

Loop:
movf	count,w
movwf	PORTC
goto	Loop
END

ericgibbs

Well-Known Member
hi 360,
Just in case you did not follow my comment about the paths.

Look in this folder on the hard drive.

C:\PROGRAM FILES\MICROCHIP\MPASM SUITE\TEMPLATE\OBJECT

and you should be able to see this file 16F690TMPO.ASM

Did you use the MPLAB Project Wizard.?

c36041254

Member
Thanks, that makes a successful build, there are some things I don't understand, that why I alwways have to change org 0x04 to org 0x05 (other wise it encounters the error:Error - section '.org_1' can not fit the absolute section. Section '.org_1' start=0x00000004, length=0x0000002a ) and I can not get that while there is no label specifying interrupt then how the programme automaticaly switch to interrupt loop? This is my final code and don't know why it does'nt work. What I want to do is that let the PIC to display whatever in count on PORT C (in binary ,by four LEDs ) and as I give HIGH to RA2 (which is external interrupt) it goes to interuupt loop and add 1 to count and then display that on PORT C and continue this till COUNT reaches 9 then it get reset.

Code:
	list	p=16f690
#include <p16f690.inc>
__CONFIG -_MCLRE_ON & _CP_OFF & _WDT_OFF & _INTRC_OSC_NOCLKOUT
ERRORLEVEL -302

cblock	0x20
temp	;RES 1
display	;RES 1
count	;RES 1
endc

;**************************STEUP THE CONSTANTS*******************************

org	0x00		;this is where we come on power up and reset
goto	Main

;**************************INTRUPT ROUTINE************************************

[COLOR="Red"]org	0x05[/COLOR]

movwf	temp   		;this and the lable Loop will run simultenously
;move w into f in case to there was someting in
;count(see first step of Loop)

incf	count,f  	;increase count by 1 and put result in count
movlw	.10   		;load w with decimal 10
subwf	count,w  	;subtract count from w and place result in w
btfss	STATUS,C  	;if in above operation count<= w then carry bit
;is set, so check for that and skip next step
;if it is set
goto	carry_on
goto	clear

carry_on:
bcf	INTCON,0x01   	;clear the INTF, just in case(read tuto. 11)
movfw	temp   		;move temp to w
retfie			;get out of intrupt loop (this will start over
; the whole INTRUPT LOOP again
clear:
clrf	count   	;set count to 0
bcf	INTCON,0x01  	;clear INTF
retfie
;*****************************MAIN PROGRAMME************************
Main:

;*****************************SET UP THE INTRUP REGISTERS***********

bsf	INTCON,0x07  	; set globel intrupt (tell PIC that we will use intrupts)
bsf	INTCON,0x04  	;
bcf	INTCON,0x01

;******************************SET UP THE PORTS**********************
bsf	STATUS,RP0
movlw	b'10000000'
movwf	TRISC
movlw	b'00000100'
movwf	TRISA	;set RA2 as input (for interrupt)
bcf	STATUS,RP0
;******************************NOW SEND THE VALUE OF COUNT TO PORTC**

Loop:
movf	count,w
movwf	PORTC
goto	Loop
END

And why this formet does'nt need linker file ?
I know these are too many quastions but please answer me I'm getting more and more confused, atleast try to answer the quastion in RED, Pleazzzzz!!

Pommie

Well-Known Member
Sorry about leaving those Res' there.

You need to remove the linker script and change the source back to org 4 to get it to compile.

You don't need a label at location 4 as the interrupt always goes there. You can put a label there if you wish.

Your code is probably not working because you have RA2 setup as analogue because it is the default. Try adding clrf ANSEL (bank 2).

Mike.

c36041254

Member
The error still persists,

Error - section '.org_1' can not fit the absolute section. Section '.org_1' start=0x00000004, length=0x00000038

and this is what I have done to code (see in RED):

Code:
  		list	p=16f690
#include <p16f690.inc>
__CONFIG -_MCLRE_ON & _CP_OFF & _WDT_OFF & _INTRC_OSC_NOCLKOUT
ERRORLEVEL -302

cblock	0x20
temp
display
count
endc

;**************************STEUP THE CONSTANTS*******************************

org	0x00		;this is where we come on power up and reset
goto	Main

;**************************INTRUPT ROUTINE************************************

org	0x04

movwf	temp   		;this and the lable Loop will run simultenously
;move w into f in case to there was someting in
;count(see first step of Loop)

incf	count,f  	;increase count by 1 and put result in count
movlw	.10   		;load w with decimal 10
subwf	count,w  	;subtract count from w and place result in w
btfss	STATUS,C  	;if in above operation count<= w then carry bit
;is set, so check for that and skip next step
;if it is set
goto	carry_on
goto	clear

carry_on:
bcf	INTCON,0x01   	;clear the INTF, just in case(read tuto. 11)
movfw	temp   		;move temp to w
retfie			;get out of intrupt loop (this will start over
; the whole INTRUPT LOOP again
clear:
clrf	count   	;set count to 0
bcf	INTCON,0x01  	;clear INTF
retfie
;*****************************MAIN PROGRAMME************************
Main:

;*****************************SET UP THE INTRUP REGISTERS***********

bsf	INTCON,0x07  	; set globel intrupt (tell PIC that we will use intrupts)
bsf	INTCON,0x04  	;
bcf	INTCON,0x01

;******************************SET UP THE PORTS**********************
bsf	STATUS,RP0
movlw	b'10000000'
movwf	TRISC
[COLOR="Red"]bcf 	STATUS,RP0
bsf	STATUS,RP1
clrf 	ANSEL[/COLOR]
movlw	b'00000100'
movwf	TRISA	;set RA2 as input (for interrupt)
bcf	STATUS,RP0
;******************************NOW SEND THE VALUE OF COUNT TO PORTC**

Loop:
movf	count,w
movwf	PORTC
goto	Loop
END

so it is still not working

Pommie

Well-Known Member
Have you removed the linker script from the project?

You are now writing to the TRISA register in bank 2!

Try,
Code:
;******************************SET UP THE PORTS**********************
bsf	STATUS,RP0		;bank 1
movlw	b'10000000'
movwf	TRISC
movlw	b'00000100'
movwf	TRISA			;set RA2 as input (for interrupt)
bcf 	STATUS,RP0		;bank 0
bsf	STATUS,RP1		;bank 2
clrf 	ANSEL
bcf	STATUS,RP1		;bank 0
;******************************NOW SEND THE VALUE OF COUNT TO PORTC**

Mike.

c36041254

Member
Sorry, I had not removed linker now it builds successfully but still all LED remains off even when I give HIGH to RA2

This is the modified code:

Code:
	list	p=16f690
#include <p16f690.inc>
__CONFIG -_MCLRE_ON & _CP_OFF & _WDT_OFF & _INTRC_OSC_NOCLKOUT
ERRORLEVEL -302

cblock	0x20
temp
display
count
endc

;**************************STEUP THE CONSTANTS*******************************

org	0x00		;this is where we come on power up and reset
goto	Main

;**************************INTRUPT ROUTINE************************************

org	0x04

movwf	temp   		;this and the lable Loop will run simultenously
;move w into f in case to there was someting in
;count(see first step of Loop)

incf	count,f  	;increase count by 1 and put result in count
movlw	.10   		;load w with decimal 10
subwf	count,w  	;subtract count from w and place result in w
btfss	STATUS,C  	;if in above operation count<= w then carry bit
;is set, so check for that and skip next step
;if it is set
goto	carry_on
goto	clear

carry_on:
bcf	INTCON,0x01   	;clear the INTF, just in case
movfw	temp   		;move temp to w
retfie			;get out of intrupt loop (this will start over
; the whole INTRUPT LOOP again
clear:
clrf	count   	;set count to 0
bcf	INTCON,0x01  	;clear INTF
retfie
;*****************************MAIN PROGRAMME************************
Main:

;*****************************SET UP THE INTRUP REGISTERS***********

bsf	INTCON,0x07  	; set globel intrupt (tell PIC that we will use intrupts)
bsf	INTCON,0x04  	;
bcf	INTCON,0x01

;******************************SET UP THE PORTS**********************
[COLOR="Red"]bsf	STATUS,RP0
movlw	b'10000000'
movwf	TRISC
movlw	b'00000100'
movwf	TRISA	;set RA2 as input (for interrupt)
bcf 	STATUS,RP0
bsf		STATUS,RP1
clrf 	ANSEL
bcf		STATUS,RP1[/COLOR];******************************NOW SEND THE VALUE OF COUNT TO PORTC**

Loop:
movf	count,w
movwf	PORTC
goto	Loop
END

ericgibbs

Well-Known Member
hi c360,
As Mike is sorting out the program I will leave that to him.

With regard to the Interrupts.
You choose in your program which Interrupts are going to be active, that is when the conditions set out in your program are met, an Interrupt will occur.

When the Interrupt occurs, the Program Counter is set by the PIC to 0x0004.

The PIC starts executing the program code it finds at 0x0004 until it reaches the RETFIE instruction, at which time the PIC will return to the next program code byte it was executing BEFORE the Interrupt occurred.

Do you follow.?

Pommie

Well-Known Member
Out of curiosity I simulated your code in MPLAB and toggled the RA2 pin every 1000 cycles. It did exactly as expected. The value on Port C went up to 9 and then back to zero.

Mike.

c36041254

Member
Yes eric I do follow that and thank you for that to the point answer but, what if I want to set more than one interrupt, I mean only one interrupt can start at 0x04
and I'm still waiting for that code to be solved please don;t forget that (this is for any one who usually jumps to the final post, so my problem is yet not solved, please read few preavious posts )

Last edited:

ericgibbs

Well-Known Member
Yes eric I do follow that and thank you for that to the point answer but, what if I want to set more than one interrupt, I mean only one interrupt can start at 0x04
and I'm still waiting for that code to be solved please don;t forget that (this is for any one who usually jumps to the final post, so my problem is yet not solved, please read few preavious posts )

hi,
On Interrupt, the ISR [Interrupt Service Subroutine] at 0x0004 will have code at the start of the ISR which tests the Interrupt flag status of the Interrupts you have enabled.

So:
ISR:
Save Flags and Wreg..etc

Is TMR0 Interrupt flag Set
If Yes, call the Timer0 subr or execute a string of code for the Timer0
;
Is TMR1 Interrupt flag Set.
If Yes, do Timer2 subr
;
Is PORTB on change Interrupt Set.
If Yes do PORTB subr

Restore Flags, Wreg etc

RETFIE; return to the main program where you left it + 1

You can have any number of Interrupts in the ISR.

This is a very basic explanation, but do you get the picture.?

c36041254

Member
O.K. so this is what I make out of it:
When an interrupt occur the programme jumps to 0x04 and check for which (external,timer etc.) the interrupt has encountered and execute the appropriate interrupt routin (I mean code not routine as thee would be only one interrupt routin for all interrupts). Thanks!

(this is for any one who usually jumps to the final post, my problem is yet not solved, please read few preavious posts )

ericgibbs

Well-Known Member
(this is for any one who usually jumps to the final post, my problem is yet not solved, please read few preavious posts )

Hi,

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