max530.h

MAXIM（美信）公司生产的MAX530(12位DA)驱动程序 平台为keil 编程语言为c51

/**************************************************/
/********       MAX530.H C51 driver      **********/
/********   Written by Tnxn---20060827   **********/
/**************************************************/

/***************************************************
修改纪录:
***************************************************/
sbit D0=P1^0;
sbit D1=P1^1;
sbit D2=P1^2;
sbit D3=P1^3;
sbit A0=P1^4;
sbit A1=P1^5;
sbit CS=P1^6;
sbit LDAC=P1^7;

//==================外部函数======================//
void MAX530(unsigned int volt);
//================================================//


//------------------------------------------------//
void MAX530(unsigned int volt)
{
	unsigned char tmp;
	A0=1;
	A1=1;
	CS=1;
	LDAC=1;

	tmp=(unsigned char)volt;

	D0=tmp&0x01?1:0;
	D1=tmp&0x02?1:0;
	D2=tmp&0x04?1:0;
	D3=tmp&0x08?1:0;

	A0=0;
	A1=1;
	CS=0;
	CS=1;

	volt=volt>>4;
	tmp=(unsigned char)volt;

	D0=tmp&0x01?1:0;
	D1=tmp&0x02?1:0;
	D2=tmp&0x04?1:0;
	D3=tmp&0x08?1:0;

	A0=1;
	A1=0;
	CS=0;
	CS=1;

	volt=volt>>4;
	tmp=(unsigned char)volt;
	
	D0=tmp&0x01?1:0;
	D1=tmp&0x02?1:0;
	D2=tmp&0x04?1:0;
	D3=tmp&0x08?1:0;

	A0=1;
	A1=1;
	CS=0;
	CS=1;

	LDAC=0;
	LDAC=1;

}
//------------------------------------------------//