external interrupt address - Electronic Circuits Projects Diagrams Free

neelam29 · 24th February 2006, 06:23 PM

if an timer overflow generates interrupt , the controller goes to location
ORG 0x04
so,when an external interrupt is generated where will the controller jump to ,i mean which address

org......?
and if it is same 0x04 ,then how will microcontroler differentiate between the two interrupts?

m using pic16f628a and pic16f877a

thanks

raitl · 24th February 2006, 06:56 PM

the pic will go to ORG 0x04 in any interrupt. Then you just check different interrupt flags to find out which interrupt occurred.

neelam29 · 24th February 2006, 07:00 PM

thanks for replying could u please tell me one more thing ...how to complement a bit in pic.cause comf instruction is used to comple ment the whole register......which instruction is used to complement only a bit ...

raitl · 24th February 2006, 07:12 PM

check this link: http://fribotte.free.fr/bdtech/picnu...heAide_en.html

Pommie · 25th February 2006, 03:00 AM

Quote:

Originally Posted by neelam29

thanks for replying could u please tell me one more thing ...how to complement a bit in pic.cause comf instruction is used to comple ment the whole register......which instruction is used to complement only a bit ...

You can use the XOR instruction to complement a bit.
To complement bit 5 you would do,

Code:

         movlw   b'00100000'
         xorwf   Location,F

Mike.

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24th February 2006, 06:23 PM	#1
neelam29	external interrupt address if an timer overflow generates interrupt , the controller goes to location ORG 0x04 so,when an external interrupt is generated where will the controller jump to ,i mean which address org......? and if it is same 0x04 ,then how will microcontroler differentiate between the two interrupts? m using pic16f628a and pic16f877a thanks

24th February 2006, 06:56 PM	#2
raitl	the pic will go to ORG 0x04 in any interrupt. Then you just check different interrupt flags to find out which interrupt occurred. __________________ Here...let me improve it for you! Puff of smoke ....oops...

24th February 2006, 07:00 PM	#3
neelam29	thanks for replying could u please tell me one more thing ...how to complement a bit in pic.cause comf instruction is used to comple ment the whole register......which instruction is used to complement only a bit ...

24th February 2006, 07:12 PM	#4
raitl	check this link: http://fribotte.free.fr/bdtech/picnu...heAide_en.html __________________ Here...let me improve it for you! Puff of smoke ....oops...