AVR-Chat

...And your interrupt vector for Compare match A is wrong.  It's the 
one before it that you want (I just single-stepped it and it hit the 
reti on the line before, as indicated below with asterisks.  Have a 
look at page 46 of the data-sheet.  With that changed, it hits the 
interrupt every 3.6ms with a 4MHz clock.



Richard 
RESET:
   rjmp BEGIN
   reti			;Addr $01
   reti			;Addr $02
   reti			;Addr $03
   reti			;Addr $04
   rjmp    TIMER0	;timer/counter 0 overfLOWBYTE interrupt
   reti			; Addr $06
   reti			; Addr $07
   reti			; Addr $08
   reti			; Addr $09
***reti			; Addr $0A***
   rjmp    TIMER0 	; timer/counter 0 compare match A interrupt
   reti			; Addr $0C
   reti			; Addr $0D
   reti			; Addr $0E
   reti			; Addr $0F
   reti			; Addr $10> 


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