preface.asm

Motorola 6812芯片开发的接口程序。

; Preface 6812 assembly language programs
; Jonathan W. Valvano
; This software accompanies the book,
; Embedded Microcomputer Systems: Real Time Interfacing
; published by Brooks Cole, 1999
;
; Program P.1 (Preface)
; MC68HC812A4
PORTA equ  $0000
      org  $F000   Programs in EEPROM
Start ldaa PORTA   input Port A
      staa $0800   save in RAM
      bra  Start
      org  $FFFE
      fdb  Start   beginning address