Motorola Axiom CMD11E1 Betriebsanweisung PDF herunterladen (Seite 77)

Chapter 7

Interrupt Processing

7.1 Objective

To become familiar with interrupt processing.

7.2 Background

In an earlier lab, you had to generate a 30.52 Hz square wave signal on PA4 pin.

The code for generating the square wave is given below for your reference. Make

sure that you run the program and verify that you get the square wave before

proceeding further. Also, to understand this lab, you must connect the PA4 pin

to a oscilloscope and see the square waves.

; Various defines go here ...

ORG $3000 don’t forget the $

ME FCC /Your name/

FCB 10

FCC /ECE 372/

FCB 10

FCC /Date the program was last changed/

FCB 10, 10, 4

ORG $2000 DONT FORGET THE $

LDX #ME

JSR OUTSTRG ; MAKE SURE YOU HAVE EQU FOR OUTSTRG

LOOP1

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Motorola Axiom CMD11E1 Betriebsanweisung Seite 77