Motorola Axiom CMD11E1 Guia do Utilizador descarregar pdf (Página 38)

38 CHAPTER 3. FUNCTIONS AND BIT MANIPULATIONS

; the function destroys the value in a,

; so re load it! then print second digit

TBA

JSR OUTRHLF

; now print a colon and some spaces

LDAA #’:’

JSR OUTA

LDAA #’ ’

JSR OUTA

; now print it in binary

; b has the value to be printed (recall the old tab)

;

; shift b to the left by one bit and print ’0’ or ’1’ depending

; on what is in the carry flag

; repeat 8 times.

;

; we will use X register as counter

; to print what is in carry flag, we will load A

; with the code for ’0’ ; and add the carry to the code

; prior to calling OUTA

LDX #8 *COUNTER

PRBLOOP CPX #0

BEQ PRBDONE

LDAA #’0’

LSLB

ADCA #0

JSR OUTA

DEX

BRA PRBLOOP

PRBDONE

JSR OUTCRLF

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 100 101

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Motorola Axiom CMD11E1 Guia do Utilizador Página 38