学习单片机之---伪本征函数——Keil C51头文件INTRINS.H的应用演示(hotpower) [复制链接]

伪本征函数——Keil C51头文件INTRINS.H的应用演示(hotpower)


/*--------------------------------------------------------------------------
    伪本征函数——Keil C51头文件INTRINS.H的应用演示
            作者：[email]HotPower@126.com[/email] 2004.5.16 第一版
--------------------------------------------------------------------------*/
#include "reg51.h"
#include "intrins.h"

unsigned char readdata(void)
{
unsigned char val;
for (val = 8; val > 0; val--)
{
  _clrb_(TXD);
_nop_();
  _movcb_(RXD);
  _rrca_();
  _setb_(TXD);
_nop_();
}
_movra_(val);
return val;
}

void writedata(unsigned char val)
{
_movar_(val);
for (val = 8; val > 0; val--)
{
  _clrb_(TXD);
  _rrca_();
  _movbc_(RXD);
  _setb_(TXD);
_nop_();
}
}


main()
{
unsigned char i;
/*----------------------------------
_movb0_();演示
-----------------------------------*/
i = 0x01;
_movb0_(TXD,i);

i = 0x02;
TXD = i & 0x01;

i = 0x03;
if (i & 0x01) TXD = 1;
else TXD = 0;
/*---------------------------------*/

/*----------------------------------
_movb7_();演示
-----------------------------------*/
i = 0x04;
_movb7_(RXD,i);

i = 0x05;
TXD = i & 0x80;

i = 0x06;
if (i & 0x80) TXD = 1;
else TXD = 0;

i = 0x07;
if (i >= 0x80) TXD = 1;
else TXD = 0;
/*---------------------------------*/

/*----------------------------------
_rlcar_();_movra_()组合演示
-----------------------------------*/
i = 0x08;
_setc_();
_movra_(i);

i <<= 1;
i |= 0x01;

i <<= 1;
i ++;

i += i;

i *= 2;
i ++;
/*---------------------------------*/

/*----------------------------------
_rrcar_();_movra_()组合演示
-----------------------------------*/
i = 0x09;
_setc_();
_rrcar_(i);
_movra_(i);

i >>= 1;
i |= 0x80;
/*---------------------------------*/

i = readdata();
writedata(i);
while(1);
}