13-存储器扩展技术
//io扩展
#include "reg52.h"
void Delay(unsigned char t)
{
while(t--);
}
void SelectHC573(unsigned char n)
{
switch(n)
{
case 4:
P2 = (P2&0x1f)|0x80;//LED
break;
case 5:
P2 = (P2&0x1f)|0xa0;//蜂鸣器
break;
case 6:
P2 = (P2&0x1f)|0xc0;//位选
break;
case 7:
P2 = (P2&0x1f)|0xe0;//段选
break;
}
}
void LEDRunning()
{
SelectHC573(4);
P0 = 0xf0;
Delay(60000);
Delay(60000);
P0 = 0x0f;
Delay(60000);
Delay(60000);
}
void SMGRunning()
{
unsigned char i;
for(i = 0;i < 8;i++)
{
SelectHC573(6);
P0 = 0x01 << i;
SelectHC573(7);
P0 = 0x00;
Delay(60000);
Delay(60000);
}
P0 = 0xff;
Delay(60000);
Delay(60000);
}
void main()
{
SelectHC573(5);
P0 = 0x00;
while(1)
{
LEDRunning();
SMGRunning();
}
}
//存储器扩展
#include "reg52.h"
#include "absacc.h"
void Delay(unsigned int t)
{
while(t--);
while(t--);
}
void LEDRunning()
{
XBYTE[0x8000] = 0xf0;
Delay(60000);
Delay(60000);
XBYTE[0x8000] = 0x0f;
Delay(60000);
Delay(60000);
XBYTE[0x8000] = 0xff;
Delay(60000);
Delay(60000);
}
void SMGRunning()
{
unsigned char i;
for(i = 0;i < 8;i++)
{
XBYTE[0xc000] = 0x01 << i;
XBYTE[0xe000] = 0x00;
Delay(60000);
Delay(60000);
}
XBYTE[0xe000] = 0xff;
Delay(60000);
Delay(60000);
}
void main()
{
XBYTE[0xa000] = 0x00;
while(1)
{
LEDRunning();
SMGRunning();
}
}