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PICDEM-1 User’s Guide
CheckOne
CO1
bsf
bsf
btfsc
goto
bcf
xorwf
btfss
bsf
STATUS,RP0
EECON1,RD
EECON1,RD
CO1
STATUS,RP0
EEDATA, F
STATUS,Z
GPFLAG,EEPERROR
;pg 1
;do a read
;rd done?
;no then loop
;pg 0
;compare?
;same then skip
;set error flag
return
BlinkLeds sets up the RTCC to interrupt upon time-out, turns off the LEDs,
and when one second has expired, toggles the LEDs.
BlinkLeds
call
InitRtcc
BL1
clrf
call
comf
goto
PORTB
SecondOver
PORTB, F
BL1
;turn off leds
;wait for 1/2 second
;toggle leds
InitRtcc assigns the prescaler to the RTCC and sets it for divide by 256. It
then enables interrupts and initializes the TIME register to eight.
InitRtcc
bsf
STATUS, RP0
movlw
movwf
bcf
clrf
movlw
movwf
movlw
movwf
B’10000111’
OPTION_REG
STATUS, RP0
TMR0
B’10100000’
INTCON
.8
TIME
;rtcc inc = tcylc/256
; /
;start time
;enable interrupts
; /
;initialize time
return
ServiceRtcc is the interrupt service routine and will be called each time the
RTCC times out. It first verifies that the interrupt was caused by the RTCC and
if it was it decrements TIME . Whether it was an RTCC interrupt or not, all
interrupts are cleared and the RTCC interrupt is enabled before returning.
ServiceRtcc
btfsc
decf
clrf
bsf
retfie
DS33015C-page 30
INTCON,T0IF
TIME, F
INTCON
INTCON,T0IE
;rtcc interrupt?
;yes then dec time
;clr all interrupts
;enable RTIE
;not zero then return
? 1999 Microchip Technology Inc.
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