Accell MPC-68K Series Manuale Utente Scaricare il pdf (Pagina 21)

I/O control

 You can control an I/O Port for every bit or byte.

 Bit operating is for simple device control. ex. solenoid valves, relays and switches etc.

 Byte operating is used for reading DSW, data exchange with external devices etc.

Bit control

ON 0 /* output #0 turn on

OFF 1 /* output #1 turn off

WAIT SW(192)==1 /* wait for input #192 to turn on

IF SW(1)==1 THEN : GOTO *LABEL : END_IF /* conditional branch

ON -1 /* negative number = memory I/O.

WAIT SW(-2)==0 /*

Byte control

OUT 170 0 /* 170(decimal) is outputted to bank #0.

A=IN(0) /* the value of bank#0 loads to variable A.

OUT A B /* the value of A loads to out-port B.

WAIT IN(1)==255 /* wait to reach 255.

IF IN(2)==&H0F THEN : GOTO *LABEL : END_IF /* conditional branch

OUT &HFF -1 /* negative number is memory I/O.

WAIT IN(-1)==&HAA /*

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Accell MPC-68K Series Manuale Utente Pagina 21