preface.c

Motorola 6812芯片开发的接口程序。

// Preface 6812 C programs
// Jonathan W. Valvano
// This software accompanies the book,
// Embedded Microcomputer Systems: Real Time Interfacing
// published by Brooks Cole, 1999

// Program P.2 (Preface)
// MC68HC812A4/MC68HC912B32
#define PORTA *(char volatile*)(0x0000)
char data;
void main(void){
    while(1){
      data=PORTA;}
}
#pragma abs_address:0xfffe
void (*reset_vector[])() = { _start };
#pragma end_abs_address