Motorola Axiom CMD11E1 Guia do Utilizador descarregar pdf (Página 89)

8.4. 500 HZ TONE GENERATOR 89

SEI

LDD #1000

STD ONTIME

LDD #3000

STD OFFTIME

LDAA #%01000000

STAA TMSK1

CLI

; Now go about your business of printing Z’s

LDAA #’Z’

LOOP JSR OUTA

BRA LOOP

; End of main program

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

; INTERRUPT SERVICE

SERVICE

; TOGGLE PA4

LDAA #%00010000

EORA PORTA

STAA PORTA

; TEST TO SEE IF THE PIN WENT HIGH

ANDA #%00010000

BNE WENTHIGH

; NO, PIN WENT LOW. LOAD D WITH OFFTIME

LDD OFFTIME

BRA REST

WENTHIGH

; PIN WENT HIGH. LOAD D WITH ONTIME

LDD ONTIME

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