preface.c

Motorola 6811芯片开发的接口程序。

// Preface 6811 C programs
// Jonathan W. Valvano
// This software accompanies the book,
// Embedded Microcomputer Systems: Real Time Interfacing
// published by Brooks Cole, 1999

// MC68HC11A8
#define PORTA *(char volatile*)(0x1000)
char data;
void main(void){
    while(1){
      data=PORTA;}
}
#pragma abs_address:0xfffe
void (*reset_vector[])() = { _start };
#pragma end_abs_address