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    MSP430和實時時鐘HT1381的接口程序
    


    
    
    
發布時間：2008-11-6 21:48    
發布者：MSP430

    


    

    


    關鍵詞：
    MSP430    , 實時時鐘    , HT1381    , 接口程序
    


    
 

    

    
HT1381是臺灣HT公司的一款串行實時時鐘IC，工作電壓： 2.0V~5.5V，最大輸入串行時鐘500kHz （ VDD=2V），2MHz（VDD=5V） ；工作電流：2V時小于300nA，5V時小于1mA。串行I/O 傳送，二種數據傳送方式：單字節或多字節（Burst方式），所有寄存器以BCD碼格式存儲具有接口簡單、功耗低、工作電壓范圍寬、計時精確、功能全、成本低等優點，因此在實際應用中被廣泛采用。該芯片提供秒、分、時、日、日期、月和年的信息。對于小于31天的月的月末日期能自動進行調整，還包括閏年校正功能。低功耗設計且時鐘的運行可以采用24小時格式或帶AM/PM指示的12小時的格式。

以下是接口程序，430測試頻率為4M。

#define NOP _NOP();_NOP()

#define NowSec cNowTime[0] 
#define NowMin cNowTime[1]
#define NowHour cNowTime[2]
#define NowDate cNowTime[3]
#define NowMonth cNowTime[4]
#define NowYear cNowTime[5]

#define SetSec cSetTime[0] 
#define SetMin cSetTime[1]
#define SetHour cSetTime[2]
#define SetDate cSetTime[3]
#define SetMonth cSetTime[4]
#define SetYear cSetTime[5]

uchar Temp_Count;
uchar cSetTime[6]; 
uchar cNowTime[6];

void Timer_Out_Byte(uchar OutByte);
uchar Timer_In_Byte(void);

void ReadRealtime(void)
{
NOP;
HT1381_OUTPORT &=~Timer_SCL; //Timer_SCL=0;
NOP;
HT1381_OUTPORT |= Timer_Rest; //Timer_Rest=1;

Timer_Out_Byte(0xBF); //Read, Burst Mode

for(TimeCount=0;TimeCount<6;TimeCount++)
{
if (TimeCount==5)
Timer_In_Byte(); //dummy read.
cNowTime[TimeCount]=Timer_In_Byte();
//change BCD to uchar
cNowTime[TimeCount]=(cNowTime[TimeCount]/0x10)*10+(cNowTime[TimeCount]%0x10);
}
NOP;
HT1381_OUTPORT &=~Timer_Rest; //Timer_Rest=0;
}

void WriteRealtime(void)
{
NOP;
HT1381_OUTPORT &=~Timer_Rest; //Timer_Rest=0; //for sure to close rest.
NOP;
HT1381_OUTPORT &=~Timer_SCL; //Timer_SCL=0;
NOP;
HT1381_OUTPORT |= Timer_Rest; //Timer_Rest=1;
Timer_Out_Byte(0x8E); //Write,Single Mode
Timer_Out_Byte(0x00); //Write, Protect Byte=0, Disable protect
NOP;
HT1381_OUTPORT &=~Timer_Rest; //Timer_Rest=0;


NOP;
HT1381_OUTPORT |= Timer_Rest; //Timer_Rest=1;
Timer_Out_Byte(0x80); //Write,Single Mode
Timer_Out_Byte(0x00); //Write, OSC enalbe, old second distroied
NOP;
HT1381_OUTPORT &=~Timer_Rest; //Timer_Rest=0;

for(TimeCount=0;TimeCount<6;TimeCount++)
{
//change uchar to BCD
cSetTime[TimeCount]=(cSetTime[TimeCount]/10)*0x10+(cSetTime[TimeCount]%10);
}

NOP;
HT1381_OUTPORT |= Timer_Rest; //Timer_Rest=1;
Timer_Out_Byte(0XBE); //Write,Burst Mode
Timer_Out_Byte(SetSec & 0x7F); //OSC enable for sure. 
Timer_Out_Byte(SetMin);
Timer_Out_Byte(SetHour & 0x7F); //24 Hour Mode
Timer_Out_Byte(SetDate);
Timer_Out_Byte(SetMonth);
Timer_Out_Byte(0x00);
Timer_Out_Byte(SetYear);
Timer_Out_Byte(0x00);
NOP;
HT1381_OUTPORT &=~Timer_Rest; //Timer_Rest=0;

NOP;
HT1381_OUTPORT |= Timer_Rest; //Timer_Rest=1;
Timer_Out_Byte(0x8E); //Write,Single Mode
Timer_Out_Byte(0x80); //Write, Protect Byte=0, enable protect
NOP;
HT1381_OUTPORT &=~Timer_Rest; //Timer_Rest=0;

}


void Timer_Out_Byte(uchar OutByte)
{
uchar Timer_Count;
for (Timer_Count=0;Timer_Count<8;Timer_Count++)
{
HT1381_DIRPORT |= Timer_SDA; //output
if ((OutByte & 0x01) == 0)
HT1381_OUTPORT &=~Timer_SDA; 
else
HT1381_OUTPORT |= Timer_SDA; 
NOP;
HT1381_OUTPORT |= Timer_SCL; 
NOP;
HT1381_OUTPORT &=~Timer_SCL; //Timer_SCL=0;
utByte = OutByte >> 1;
}
}


uchar Timer_In_Byte(void)
{
uchar InByte,Timer_Count;

InByte=0x00;
HT1381_DIRPORT &=~Timer_SDA; //Timer_SDA=1;//input

for (Timer_Count=0;Timer_Count<8;Timer_Count++)
{
InByte >>= 1;
NOP;
HT1381_OUTPORT |= Timer_SCL; 
if(HT1381_INPORT&Timer_SDA)
InByte |= 0x80;
else
InByte &= 0x7F;

NOP;
HT1381_OUTPORT &=~Timer_SCL; //Timer_SCL=0;
}

return(InByte);
}
#define NOP _NOP();_NOP()

#define NowSec cNowTime[0] 
#define NowMin cNowTime[1]
#define NowHour cNowTime[2]
#define NowDate cNowTime[3]
#define NowMonth cNowTime[4]
#define NowYear cNowTime[5]

#define SetSec cSetTime[0] 
#define SetMin cSetTime[1]
#define SetHour cSetTime[2]
#define SetDate cSetTime[3]
#define SetMonth cSetTime[4]
#define SetYear cSetTime[5]

uchar Temp_Count;
uchar cSetTime[6]; 
uchar cNowTime[6];

void Timer_Out_Byte(uchar OutByte);
uchar Timer_In_Byte(void);

void ReadRealtime(void)
{
NOP;
HT1381_OUTPORT &=~Timer_SCL; //Timer_SCL=0;
NOP;
HT1381_OUTPORT |= Timer_Rest; //Timer_Rest=1;

Timer_Out_Byte(0xBF); //Read, Burst Mode

for(TimeCount=0;TimeCount<6;TimeCount++)
{
if (TimeCount==5)
Timer_In_Byte(); //dummy read.
cNowTime[TimeCount]=Timer_In_Byte();
//change BCD to uchar
cNowTime[TimeCount]=(cNowTime[TimeCount]/0x10)*10+(cNowTime[TimeCount]%0x10);
}
NOP;
HT1381_OUTPORT &=~Timer_Rest; //Timer_Rest=0;
}

void WriteRealtime(void)
{
NOP;
HT1381_OUTPORT &=~Timer_Rest; //Timer_Rest=0; //for sure to close rest.
NOP;
HT1381_OUTPORT &=~Timer_SCL; //Timer_SCL=0;
NOP;
HT1381_OUTPORT |= Timer_Rest; //Timer_Rest=1;
Timer_Out_Byte(0x8E); //Write,Single Mode
Timer_Out_Byte(0x00); //Write, Protect Byte=0, Disable protect
NOP;
HT1381_OUTPORT &=~Timer_Rest; //Timer_Rest=0;


NOP;
HT1381_OUTPORT |= Timer_Rest; //Timer_Rest=1;
Timer_Out_Byte(0x80); //Write,Single Mode
Timer_Out_Byte(0x00); //Write, OSC enalbe, old second distroied
NOP;
HT1381_OUTPORT &=~Timer_Rest; //Timer_Rest=0;

for(TimeCount=0;TimeCount<6;TimeCount++)
{
//change uchar to BCD
cSetTime[TimeCount]=(cSetTime[TimeCount]/10)*0x10+(cSetTime[TimeCount]%10);
}

NOP;
HT1381_OUTPORT |= Timer_Rest; //Timer_Rest=1;
Timer_Out_Byte(0XBE); //Write,Burst Mode
Timer_Out_Byte(SetSec & 0x7F); //OSC enable for sure. 
Timer_Out_Byte(SetMin);
Timer_Out_Byte(SetHour & 0x7F); //24 Hour Mode
Timer_Out_Byte(SetDate);
Timer_Out_Byte(SetMonth);
Timer_Out_Byte(0x00);
Timer_Out_Byte(SetYear);
Timer_Out_Byte(0x00);
NOP;
HT1381_OUTPORT &=~Timer_Rest; //Timer_Rest=0;

NOP;
HT1381_OUTPORT |= Timer_Rest; //Timer_Rest=1;
Timer_Out_Byte(0x8E); //Write,Single Mode
Timer_Out_Byte(0x80); //Write, Protect Byte=0, enable protect
NOP;
HT1381_OUTPORT &=~Timer_Rest; //Timer_Rest=0;

}


void Timer_Out_Byte(uchar OutByte)
{
uchar Timer_Count;
for (Timer_Count=0;Timer_Count<8;Timer_Count++)
{
HT1381_DIRPORT |= Timer_SDA; //output
if ((OutByte & 0x01) == 0)
HT1381_OUTPORT &=~Timer_SDA; 
else
HT1381_OUTPORT |= Timer_SDA; 
NOP;
HT1381_OUTPORT |= Timer_SCL; 
NOP;
HT1381_OUTPORT &=~Timer_SCL; //Timer_SCL=0;
utByte = OutByte >> 1;
}
}


uchar Timer_In_Byte(void)
{
uchar InByte,Timer_Count;

InByte=0x00;
HT1381_DIRPORT &=~Timer_SDA; //Timer_SDA=1;//input

for (Timer_Count=0;Timer_Count<8;Timer_Count++)
{
InByte >>= 1;
NOP;
HT1381_OUTPORT |= Timer_SCL; 
if(HT1381_INPORT&Timer_SDA)
InByte |= 0x80;
else
InByte &= 0x7F;

NOP;
HT1381_OUTPORT &=~Timer_SCL; //Timer_SCL=0;
}

return(InByte);
} 


    



    

    

    


    

    

    		



    



    
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