Motorola Axiom CMD11E1 Podręcznik Użytkownika Pobierz pdf (Strona 99)

9.7. A SIMPLE DIGITAL VOLTMETER 99

TAB *COPY A TO B

H2B.LT

CMPB #10 *IS B < 10

BLO H2B.DONE *IF SO WE ARE DONE

SUBB #10 *B <- B-10

ADDA #6 *A <- A+6

BRA H2B.LT

H2B.DONE

PULB

RTS

7. We can go back and repeat the steps (the ﬁrst need not be performed more

than once). It is convenient to check the keyboard and go back only if the

user has not pressed the ESC key (code 27).

The complete program to achieve these steps is given below

;;;;;;;;;;;;;;;;;;;;;Start: A/D code ;;;;;;;;;;;;;;;;;;;;;;

OUTLHLF EQU $FFB2

OUTRHLF EQU $FFB5

OUTCRLF EQU $FFC4

INPUT EQU $FFAC

OUTA EQU $FFB8

OPTION EQU $1039

ADCTL EQU $1030

ADR1 EQU $1031

ORG $C000

;STEP 1

;TURN A/D ON

LDAA #%10000000

STAA OPTION

LDAA #40

DECA

BNE LT

1 2 ... 94 95 96 97 98 99 100 101

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Motorola Axiom CMD11E1 Podręcznik Użytkownika Strona 99