2 different time delays, same register?

[tempus]

Hey all;

I'm getting very close to completing my first PIC program. My design calls for 2 different time delays - 1 for debouncing (10ms) and 1 to control a mute function (2ms). The 2 never run at the same time (at least I don't think they do), so is it OK to use the same register for both counters?

Here's a sample of my code (16F737):

; Counter locations
dbcount equ 0x21h
dc1 equ 0x22h

; debounce switch down
db_down movlw 0x0d ;max count = 10ms/768us = 13 = 0x0d
movwf dbcount
clrf dc1 ;reset dc1
dn_dly incfsz dc1,f ;delay 256x3 = 768us
goto dn_dly
btfsc portb,7 ;if button up (RB7 hi),
goto db_down ; restart count
decfsz dbcount,f ;else repeat until max count is reached
goto dn_dly
bsf porta,6 ;turn mute on
movlw b'01101001'
movwf portc ;turn comp and delay on
bsf porta,5 ;output hi RA5 - vb off
nop
bsf porta,7 ;output hi RA7 - lead channel on
call mutedelay ;mute for 2ms
bcf porta,6 ;turn mute off
; debounce switch up
db_up movlw 0x0d ;max count = 10ms/768us = 13 = 0x0d
movwf dbcount
clrf dc1 ;reset dc1
up_dly incfsz dc1,f ;delay 256x3 = 768us
goto up_dly
btfss portb,7 ;if button down (RB7 lo),
goto db_up ; restart count
decfsz dbcount,f ;else repeat until max count is reached
goto up_dly
goto switch ;check switches again
;-----------------------------------------------------------------------------
; mutedelay - 2ms delay
;
mutedelay movlw 0x03 ;max count = 2ms/768us = 3
movwf dbcount
clrf dc1 ;reset dc1
incfsz dc1,f ;delay 256x3 = 768us
goto up_dly
decfsz dbcount,f ;else repeat until max count is reached
goto up_dly
return

Sorry everything's so jammed together, but i can't seem to get things spaced properly in the message window.
Thanks

 

[ericgibbs]

hi
You can use a register counter for any count down routine, ensure that two routines dont use the reg at the same time.

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Here's	a	sample of my code (16F737):

; Counter locations  
dbcount	equ	0x21h
dc1	equ	0x22h

; debounce switch down  
db_down	movlw	0x0d		;max count = 10ms/768us = 13 = 0x0d
	movwf	dbcount
	clrf	dc1		;reset dc1
dn_dly	incfsz	dc1,f		;delay 256x3 = 768us
	goto	dn_dly
	btfsc	portb,7		;if button up (RB7 hi),
	goto	db_down		; restart count
	decfsz	dbcount,f	;else repeat until max count is reached
	goto	dn_dly
	bsf	porta,6		;turn mute on
	movlw	b'01101001'
	movwf	portc		;turn comp and delay on
	bsf	porta,5		;output hi RA5 - vb off
	nop
	bsf	porta,7		;output hi RA7 - lead channel on
	call	mutedelay	;mute for 2ms
	bcf	porta,6		;turn mute off
; debounce switch up  
db_up	movlw	0x0d		;max count = 10ms/768us = 13 = 0x0d
	movwf	dbcount
	clrf	dc1		;reset dc1
up_dly	incfsz	dc1,f		;delay 256x3 = 768us
	goto	up_dly
	btfss	portb,7		;if button down (RB7 lo),
	goto	db_up		; restart count
	decfsz	dbcount,f	;else repeat until max count is reached
	goto	up_dly
	goto	switch		;check switches again
;-----------------------------------------------------------------------------  
; mutedelay - 2ms delay  
;
mutedelay movlw	0x03		;max count = 2ms/768us = 3
	movwf	dbcount
	clrf	dc1		;reset dc1
	incfsz	dc1,f		;delay 256x3 = 768us
	goto	up_dly
	decfsz	dbcount,f	;else repeat until max count is reached
	goto	up_dly
	return