pic16f84 help needed - Electronic Circuits Projects Diagrams Free

yokivo · 19th August 2007, 11:52 AM

i am trying to use pic16f84 but can'nt do so

. please some one help me i have created uJDM programmer which is successfully writing hex file in pic. but when i put pic in circuit (e.g led flasher ) it do'nt work. please help me.
yokivo (yokivo(at)yahoo(dot)com)

Kyle-s4h · 19th August 2007, 02:43 PM

I don't think too many people will be able to help you with the information provided.

Try posting your code and if you don't have schematics, post how you have your circuit wired (ie. what ports and pins go to what).

OY2L · 19th August 2007, 05:29 PM

As Kyle-s4h said, post your .ASM code and schematic. Then we at least have a chance to help with your problem.

Gayan Soyza · 20th August 2007, 04:30 AM

If there is no PIC in the programmer also some software’s verify success after programming. But actually there was no any PIC in the programmer.

Single transistor uJDM programmer well working with the 84A PIC. Better post the coding as earlier mentioned. So we can determine which is wrong.

bananasiong · 20th August 2007, 04:46 AM

Quote:

Originally Posted by Gayan Soyza

If there is no PIC in the programmer also some software’s verify success after programming. But actually there was no any PIC in the programmer.

Single transistor uJDM programmer well working with the 84A PIC. Better post the coding as earlier mentioned. So we can determine which is wrong.

Haha, that's crap software

Luckily the software I use doesn't. I won't show verify or programming success if there is no PIC

But it shows erase completed even there is no PIC.
I seldom use the erase button because I've set it to auto erase before programming.

yokivo · 24th August 2007, 07:46 AM

Ok here is asm and schematic i used please tell me if i have some problem with it. thanks in advance.

;File DEMO.ASM
;Assembly code for PIC16F84 micro controller
;Blinks LED's on the outputs in a rotating pattern.
;With 75khz osc, each LED stays on half a second.
;CPU configuration
; (its a 16F84,RC Oscillator, watchdog timer off, power-up timer on)
processor 16f84
include <p16f84.inc>
_config _RC_OSC &_WDT_OFF &_PWRITE_ON
;Declare variables at 2 memory locations.
J equ H'1F' ;J=Address hex 1F
K equ H'1E' ;K=Address hex 1E
;Program
org 0 ;start at address 0
;Set port B as output and initialize it
movlw B'00000000' ;w : =00000000 binary
tris PORTB ;port B ctrl register := w
movlw B'00000001' ;w := 00000001 binary
movwf PORTB ;port B itself := w
;Rotate the bits of port B leftward
mloop: rlf PORTB,f
;Waste some time by executing nested loops.
movlw D'50' ;w := 50 decimal
movwf J ;J :=w
jloop: movwf K ;K :=w
kloop: decfsz J,f ;J = J -1, skip next if zero
goto kloop
decsz J,f ;J = J - 1, skip next if zero
goto jloop
;Do it all again
goto mloop
end

[IMG]C:\Documents and Settings\ansr1\My Documents\My Pictures\ch.bmp[/IMG]

Gayan Soyza · 24th August 2007, 08:15 AM

After _config line apply this coding & see but its better use 4.7K resister & 22pf capacitor in your RC oscillator.

Code:

	org	0x0000
	
	bsf	STATUS,RP0
	clrf	TRISA
	clrf	TRISB
	bcf	STATUS,RP0
	clrf	PORTB
	clrf	1Fh
	clrf	1Eh

Main	bcf	STATUS,C
	movlw	b'00000001'
	movwf	PORTB
	call	DELAY
	rlf	PORTB,f
	call	DELAY
	btfss	STATUS,C
	goto	$-3
	goto	Main

DELAY	decfsz	1Fh,f
	goto	$-1
	decfsz	1Eh,f
	goto	$-3
	Return

	end

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19th August 2007, 11:52 AM	(permalink)
yokivo	pic16f84 help needed i am trying to use pic16f84 but can'nt do so . please some one help me i have created uJDM programmer which is successfully writing hex file in pic. but when i put pic in circuit (e.g led flasher ) it do'nt work. please help me. yokivo (yokivo(at)yahoo(dot)com)

19th August 2007, 02:43 PM	(permalink)
Kyle-s4h	I don't think too many people will be able to help you with the information provided. Try posting your code and if you don't have schematics, post how you have your circuit wired (ie. what ports and pins go to what).

19th August 2007, 05:29 PM	(permalink)
OY2L	As Kyle-s4h said, post your .ASM code and schematic. Then we at least have a chance to help with your problem.

20th August 2007, 04:30 AM	(permalink)
Gayan Soyza	If there is no PIC in the programmer also some software’s verify success after programming. But actually there was no any PIC in the programmer. Single transistor uJDM programmer well working with the 84A PIC. Better post the coding as earlier mentioned. So we can determine which is wrong. __________________ Gayan My Website http://gsmicro.blogspot.com/

24th August 2007, 07:46 AM	(permalink)
yokivo	Ok here is asm and schematic i used please tell me if i have some problem with it. thanks in advance. ;File DEMO.ASM ;Assembly code for PIC16F84 micro controller ;Blinks LED's on the outputs in a rotating pattern. ;With 75khz osc, each LED stays on half a second. ;CPU configuration ; (its a 16F84,RC Oscillator, watchdog timer off, power-up timer on) processor 16f84 include <p16f84.inc> _config _RC_OSC &_WDT_OFF &_PWRITE_ON ;Declare variables at 2 memory locations. J equ H'1F' ;J=Address hex 1F K equ H'1E' ;K=Address hex 1E ;Program org 0 ;start at address 0 ;Set port B as output and initialize it movlw B'00000000' ;w : =00000000 binary tris PORTB ;port B ctrl register := w movlw B'00000001' ;w := 00000001 binary movwf PORTB ;port B itself := w ;Rotate the bits of port B leftward mloop: rlf PORTB,f ;Waste some time by executing nested loops. movlw D'50' ;w := 50 decimal movwf J ;J :=w jloop: movwf K ;K :=w kloop: decfsz J,f ;J = J -1, skip next if zero goto kloop decsz J,f ;J = J - 1, skip next if zero goto jloop ;Do it all again goto mloop end [IMG]C:\Documents and Settings\ansr1\My Documents\My Pictures\ch.bmp[/IMG]

24th August 2007, 08:15 AM	(permalink)
Gayan Soyza	After _config line apply this coding & see but its better use 4.7K resister & 22pf capacitor in your RC oscillator. Code: org 0x0000 bsf STATUS,RP0 clrf TRISA clrf TRISB bcf STATUS,RP0 clrf PORTB clrf 1Fh clrf 1Eh Main bcf STATUS,C movlw b'00000001' movwf PORTB call DELAY rlf PORTB,f call DELAY btfss STATUS,C goto $-3 goto Main DELAY decfsz 1Fh,f goto $-1 decfsz 1Eh,f goto $-3 Return end __________________ Gayan My Website http://gsmicro.blogspot.com/ Last edited by Gayan Soyza; 24th August 2007 at 08:19 AM.