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AY0438

32-Segment CMOS LCD Driver

Microchip Technology 

AY0438

retlw B'01111101'

;decode for 6

retlw B'00000111'

;decode for 7

retlw B'01111111'

;decode for 8

retlw B'01101111'

;decode for 9

;

;

start

clrf PORTB

bsf

STATUS,RP0

;set portb 0,1&2 as outputs

movlw B'11111000'

;

/

movwf PORTB

;

/

bcf

OPTION,RBPU

;enable pull-up for switch

bcf

STATUS,RP0

wait

btfsc UPDATELCD

;see if update switch is low

goto wait

;no then wait

bcf

LOAD

;make sure load is disabled

movf LSD,w

;get least significant value

clrf PCLATH

;PCH = 0

call DecodeValue

;decode the value

call Send8

;serially output the seg values

movf SCNDSD,w

;get 2nd significant digit

call DecodeValue

;decode it

call Send8

;serially output it

movf THRDSD,w

;get 3rd significant digit

call DecodeValue

;decode it

call Send8

movf MSD,w

;get Most significant value

call DecodeValue

;decode it

call Send8

;serially send it

bsf

LOAD

;toggle the LOAD line

bcf

LOAD

;to enable the latches

KeyReleased

btfss UPDATELCD

;wait for key to be released

goto KeyReleased

goto wait

;repeat loop.

;

;Send8, sends the 8 bits in the W register

Send8

movwf temp

;save in temp

movlw .8

;init count

movwf count

;to 8

sendloop

bcf

DATAIN

;make sure DATAIN is low

rrf

temp

;rotate value through carry

btfsc STATUS,C

;if bit clear then skip

bsf

DATAIN

;else set data bit

bsf

CLK

;toggle clock

bcf

CLK

;

/

decfsz count

;see if 8 done

goto sendloop

;no then do all

return

;else return

end

DS70010I-page 6

© 1995 Microchip Technology Inc.

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