counter malfunction

[saravana_3]

i have attached the code, in this the counter 'count3' and 'count4' is counting down till zero, but the 'count5' and 'count6' will count only if the counter value is 0x01, other than this value (0x00,0x02,0x03 ...) the register value is not decrementing, what will be the reason, i am very much confused about it, hi friends please clarify.

Start
BTFSC portA,1
goto set_counter

BTFSS portA,0
goto clear_all

set_counter
bsf portB,1

bcf portB,0

bcf portB,4


;BTFSC counter_status,0
;goto wait_0


movlw 0x01 ;--- to enable counter
movwf counter_status


movlw 0xFF
movwf count3

movlw 0x0f
movwf count4

movlw 0x02
movwf count5

movlw 0x02
movwf count6

goto delay12

clear_all
BTFSC portA,1
goto set_counter

bcf portB,0

bcf portB,1

bcf portB,4
bcf portB,5
bcf portB,6
bcf portB,7

movlw 0x00 ;--- to enable counter
movwf counter_status



delay12

BTFSS counter_status,0
goto Start



decfsz count3,f
goto Start


decfsz count4,f
goto Start

bsf portB,5


decfsz count5,f
goto Start

bsf portB,6

decfsz count6,f
goto Start

bsf portB,7

goto Start

end

[Benj]

Hello

Thats one of the major problems with assembler its very hard to read and even harder to debug, If you are just getting into programming I advise you to stop learning assembler and learn C instead as assembler is a rapidly dying language and C is so much easier to read, debug and understand. Alternativly there is Flowcode which is even better

If however you must use assembler then the problem you are having is due to the following lines.

BTFSS counter_status,0 ;if counter bit 0 is set then skip goto instruction - if only bit 0 is set the counter_status = 1.
goto Start

decfsz count3,f ;decrement and skip goto if equal to zero
goto Start

decfsz count4,f ;decrement and skip goto if equal to zero
goto Start