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();
	}
}