lsr DC
ror DB
ror DA ;divide DC:DB:DA by 2
lda NA
add DA
sta NA
lda NB
adc DB
sta NB
lda NC
adc DC
sta NC ;and add into NC:NB:NA
lsla
bcs nornd ;if carry=1 then remainder<1/2 of dividend
lda RA
add #$01
sta RA
lda RB
adc #$00
sta RB ;otherwise add 1 to result
nornd: rts
;__________________________________________________________
;__________________________________________________________
UNITS: brclr 2,porta,UNITS ;let go of ENT first
lda #$01 ;===UNITS=== Allows user to select units: inches or cm
jsr lcdcmdo ;clear screen
ldhx
jsr
jsr
clr
lda
jsr
#msg03
lcdstro ;Unit Choice menu
del100ms
RA ;menu choice=0 to begin with
#$0D
lcdcmdo ;blink cursor on menu choice
uluke:
ldx RA ;get current menu choice
clrh
lda menupos,x ;and look up corresponding LCD address
jsr lcdcmdo ;reposition cursor
uwarm: brclr 1,porta,uPB1 ;check for SEL
brclr 2,porta,uPB2 ;or for ENT
bclr 4,porta ;otherwise
bset 5,porta ;turn on "SEL" LED
jsr del100ms ;delay
bset 4,porta ;toggle LEDs
bclr 5,porta ;"ENT" now on: means choice is SEL ***or*** ENT
jsr del100ms ;delay and repeat until SEL or ENT
bra uwarm
uPB1:
inc RA
;***SEL*** toggles menu choices
lda RA
cmp #$02 ;menu choices are $00 and $01
bne uPB1ok
clr RA ;back to $00 when all others have been offered
uPB1ok: bclr 4,porta
bclr 5,porta ;LEDs off
jsr del100ms ;wait a little bit
brclr 1,porta,uPB1ok ;make sure they let go of SEL
bra uluke
AN1950
Sensors
16
Freescale Semiconductor
相关PDF资料
KN500B1/4 SWITCH KNOB STRAIGHT .50" BLACK
KN5700B1/4 SWITCH KNOB STRAIGHT .75" BLACK
KN700B1/4 SWITCH KNOB STRAIGHT .75" BLACK
KS-100 PROTECTIVE COVER FOR RELAYS
KTKK-0500 CONN HEAT SHRINK TUBE SZ 8 STR
KTKK-0674 CONN HEAT SHRINK TUBE SZ E STR
KTKK-1123 CONN HEAT SHRINK TUBE SZ D ANG
KTR10EZPJ302 RES 3.0K OHM 1/8W 5% 0805 SMD
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