prnbyte.c

来自「<单片机程序设计基础>一书的配套光盘中的程序---北航---周航慈-」· C语言 代码 · 共 38 行

 #include <absacc.h>
 #include <reg51.h>
 #define uchar  unsigned char
 #define COM8155 XBYTE[0x7ff0]
 #define PA8155  XBYTE[0x7ff1]
 #define PC8155  XBYTE[0x7ff3]
sbit BUSY=P3^3;
uchar code tab[17]={0xb1,0xb1,0xbe,0xa9,0x20,
      0x53,0x50,0x52,0x49,0x4e,0x47,0x20,0x31,
      0x39,0x39,0x39,0x0a}; /*      SPRING 1999 */
uchar tl=17;

void  prt(uchar d) 
{ PA8155=d;
  PC8155=0x00;
  PC8155=0x01;
  while(BUSY);
}

void main(void)
{
  COM8155=0x0f;
  prt(0x1c); /*  */
  prt(0x26); /* */
  EA=1;
  EX1=1;
  while(1){};
}
void int1(void) interrupt 2 using 1
{
  uchar  i;
  EA=0;
  for(i=0;i<tl;i++)
    prt(tab[i]);
  EA=1;
  EX1=0;
}