SETUP AN INTERRUPT IN 16f690 - Page 5 - Electronic Circuits Projects Diagrams Free

c36041254 · 22nd May 2008, 06:53 AM

Sorry ! to bother my bread board is damaged the ckt works on the other one

Pommie · 22nd May 2008, 08:50 AM

You can't have a goto inter in your interrupt. It will never get out of the interrupt code.

Your interrupt should check the relevent bits and execute the appropriate code.
Something like this,

Code:

inter:
		movwf	temp
		swapf	STATUS,w
		clrf	STATUS
		movwf	temp_s
		btfss	INTCON,RBIF	;is it Port B change interrupt
		goto	NotPortB	;no, go check other interrupts
		movfw	PORTB		;read port B to clear change condition
		bcf	INTCON,RBIF	;Yes so clear the interrupt flag

		;put code here for RB4 change

NotPortB	btfss	INTCON,INTF	;is it INT0 interrupt
		goto	NotIntF		;no
		bcf	INTCON,INTF	;Yes so clear the interrupt flag

		;Put code here for RB0 rising edge
		
NotIntF
		swapf	temp_s,w
		movwf	STATUS
		swapf	temp,w
		retfie

You can add as many other checks as you have interrupts enabled. So, if you want a timer0 interrupt you would check INTCON,T0IF and branch as necessary.

Mike.

c36041254 · 23rd May 2008, 02:14 AM

Thanks Mike! but, some times interrupt with goto did work.!!! though I'll never do that again

c36041254 · 23rd May 2008, 02:43 AM

I used 220 ohm resistor as pull down and the codes work well but now it is melfunctioning, is it possible that the PIC is damaged because of very low (220 ohm) pull down resistance ? Can I verfy that ? Please answer me I'm worried

Pommie · 23rd May 2008, 07:46 AM

Even if you set the pin to output you wouldn't damage it (5/220=22mA). With it set to input it is impossible to damage it with a pullup/down unless you are using a supply that is too high (>5.5V).

Mike.

c36041254 · 23rd May 2008, 08:04 AM

O.K. again it is working right but, by mistake I shorted Vss and Vdd once and then the busy LED on PIC kit 2 start blinking and I have to turn off the PC and then the PIC again start melfunctioning but, after reloading the codes it works fine, Can shrting Vss and Vdd damage PIC kit or PIC ?

Pommie · 23rd May 2008, 08:11 AM

You probably crashed the Pickit2. When this happens, you can rectify it by unplugging the Pickit2 from the USB (and any other source of power) wait a few seconds and then plug it back in. Next, in MPLAB, deselect PicKit2 by selecting none and then reselect it.

Mike.

c36041254 · 23rd May 2008, 08:13 AM

Does that damaged the KIT permanently ?

Pommie · 23rd May 2008, 08:39 AM

Quote:

Originally Posted by c36041254

Does that damaged the KIT permanently ?

I don't think so but it's not a good idea.

Mike.

c36041254 · 23rd May 2008, 08:42 AM

Mine MPLAB shows (in programmer selection) pic kit 2 in gray (not available) thiugh transfering hex file still do work on kit, what should I do to make pic kit 2 available in programmer list ?

Pommie · 23rd May 2008, 08:59 AM

The Pickit2 doesn't support the 16F628, only the 16F628A. How did you get it working previously?

Mike.

c36041254 · 23rd May 2008, 11:00 AM

previously I was working on 16f690 demo board supplied with kit, so I thought it was working and now it stops but, if the kit does'nt support 16f628 then how can I be able to programme it ? That's what I have done successfuly

Edit: Though I got what do you mean by not supported but still curious that why so ?

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22nd May 2008, 06:53 AM	(permalink)
c36041254	Sorry ! to bother my bread board is damaged the ckt works on the other one __________________ CHRIS

23rd May 2008, 02:14 AM	(permalink)
c36041254	Thanks Mike! but, some times interrupt with goto did work.!!! though I'll never do that again __________________ CHRIS

23rd May 2008, 02:43 AM	(permalink)
c36041254	I used 220 ohm resistor as pull down and the codes work well but now it is melfunctioning, is it possible that the PIC is damaged because of very low (220 ohm) pull down resistance ? Can I verfy that ? Please answer me I'm worried __________________ CHRIS

23rd May 2008, 07:46 AM	(permalink)
Pommie	Even if you set the pin to output you wouldn't damage it (5/220=22mA). With it set to input it is impossible to damage it with a pullup/down unless you are using a supply that is too high (>5.5V). Mike.

23rd May 2008, 08:04 AM	(permalink)
c36041254	O.K. again it is working right but, by mistake I shorted Vss and Vdd once and then the busy LED on PIC kit 2 start blinking and I have to turn off the PC and then the PIC again start melfunctioning but, after reloading the codes it works fine, Can shrting Vss and Vdd damage PIC kit or PIC ? __________________ CHRIS

23rd May 2008, 08:11 AM	(permalink)
Pommie	You probably crashed the Pickit2. When this happens, you can rectify it by unplugging the Pickit2 from the USB (and any other source of power) wait a few seconds and then plug it back in. Next, in MPLAB, deselect PicKit2 by selecting none and then reselect it. Mike.

23rd May 2008, 08:13 AM	(permalink)
c36041254	Does that damaged the KIT permanently ? __________________ CHRIS

23rd May 2008, 08:42 AM	(permalink)
c36041254	Mine MPLAB shows (in programmer selection) pic kit 2 in gray (not available) thiugh transfering hex file still do work on kit, what should I do to make pic kit 2 available in programmer list ? __________________ CHRIS Last edited by c36041254; 23rd May 2008 at 08:43 AM.

23rd May 2008, 08:59 AM	(permalink)
Pommie	The Pickit2 doesn't support the 16F628, only the 16F628A. How did you get it working previously? Mike.

23rd May 2008, 11:00 AM	(permalink)
c36041254	previously I was working on 16f690 demo board supplied with kit, so I thought it was working and now it stops but, if the kit does'nt support 16f628 then how can I be able to programme it ? That's what I have done successfuly Edit: Though I got what do you mean by not supported but still curious that why so ? __________________ CHRIS Last edited by c36041254; 23rd May 2008 at 11:08 AM.