请问如何用一节3伏纽扣电池给8051供电？

/**

******************************************************************************

* @filesn8p_eeprom.c

* [url=home.php?mod=space&uid=187600]@author[/url] gdw

* [url=home.php?mod=space&uid=895143]@version[/url] V1.0

* [url=home.php?mod=space&uid=212281]@date[/url] 2013.3.22

* [url=home.php?mod=space&uid=247401]@brief[/url]  eeprom read&wirte

******************************************************************************

* @attention

* sn8p2711 Fcpu=Fosc/4=16MHz/4=4MHz 测试通过

* 通信速率：100KHz

******************************************************************************

*/ 







#include"sn8p_eeprom.h"



bit error;



static void delay5us(void)

{

__asm{

JMP $+1;

JMP $+1;

JMP $+1;

JMP $+1;

JMP $+1;

JMP $+1;

JMP $+1;

}

}





static void start(void) //开始信号

{ 

sdam=1;

sclm=1;

sda=1;

scl=1;

delay5us();

sda=0;

delay5us();

scl=0;

}



static void stop(void) //停止

{

sdam=1;

sclm=1;

sda=0;

delay5us();

scl=1;

delay5us();

sda=1;

delay5us();

}



static void ack(void) //应答

{

uchar i=0;

sdam=1;

sclm=1;





sda=1;//释放sda数据总线

sdam=0;

delay5us();

scl=1;



delay5us();





while((sda==1)&&(i<8))

{

i++;

}

if(i>5)

{

i=0;

error=true;

//SLEEPMODE;

}

scl=0;

}



static void MasterAck(void)

{

sclm = 1;

sdam = 1;

scl = 0;

sda = 0;//MasterAck

delay5us();

scl = 1;

delay5us();

// sda = 1; //出现问题点

sdam =0;

scl = 0;

}





static void Write_Byte(uchar data)

{

uchar i;

sclm=1;

sdam=1;

for(i=0;i<8;i++)

{

if(data&0x80>>i)

{

sda=1; 

}

else

{

sda=0;

}

delay5us();

scl=1;

delay5us();

scl=0;

}

}







static uchar Read_Byte(void)

{

uchar i,b=0;



sdam=0;

sclm=1;



for(i=0;i<8;i++)

{

scl=1;

delay5us(); 

b=(b<<1)|sda;

scl=0;

delay5us(); 

}

sda =0;

sdam=1;



return b;

}





/****************************************************************************

* _______ _ _ _ _ _ _ _ _ _ ______ 

*SCL \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ 

*

* start| 1 0 1 0 0 0 0 0 |ack |stop

* ____ ___ ___ ___

*SDA \___/ \___/ \___________________/___\___/

* 

*****************************************************************************

* _______ _ _ _ _ _ _ _ _ _____ 

*SCL \___/ \___/ \___/ \___/ \___/ \___/ \___/ \___/ \___/ 

*

* start| 1 0 1 0 0 0 0 |ack |stop 

* ____ _____ _____ ___

*SDA \____/ \_____/ \_______________________/_____\_____/

* 

*****************************************************************************

*/



/*

function: 页写入

in: DeviceAddress 设备地址

DataAddress 数据写入的起始地址

DataBuffer 数据所在的buffer地址

DataSize 数据大小 

out: 

*/

void ByteWrite(uchar DeviceAddress , uchar DataAddress , uchar data)

{

start();

Write_Byte(DeviceAddress + 0);//Write

ack();

Write_Byte(DataAddress);

ack();

Write_Byte(data);

ack();

stop();

}





/*

function: 页写入

in: DeviceAddress 设备地址

DataAddress 数据写入的起始地址

DataBuffer 数据所在的buffer地址

DataSize 数据大小 

out: 

*/

void PageWrite(uchar DeviceAddress , \

uchar DataAddress , uchar *DataBuffer ,uchar DataSize)

{

uchar p_offset;

start();

Write_Byte(DeviceAddress);

ack();

Write_Byte(DataAddress);

ack();



for(p_offset=0;p_offset<DataSize;p_offset++)

{

Write_Byte(*(DataBuffer+p_offset));

ack();

}



stop();



}





/*

function: 连续地址读

in: data ,保存数据的buffer地址 

out:

*/

void SequentialRead(uchar DeviceAddress , \

uchar DataAddress , uchar *DataBuffer, uchar NumDataRead)

{

uchar i;



start();

Write_Byte(DeviceAddress+0);//Write

ack();

Write_Byte(DataAddress);

ack();



start();

Write_Byte(DeviceAddress + 1);//Read

ack();

for(i=0;i<NumDataRead;i++)

{

*(DataBuffer+i)=Read_Byte();



MasterAck();

}

//NoAck

stop();

}





/*

function: 任意地址读

in: address

out: data



*/

uchar RandomRead(uchar DeviceAddress , uchar DataAddress)

{

uchar data;

start();

Write_Byte(DeviceAddress+0);//Write

ack();

Write_Byte(DataAddress);

ack();



start();

Write_Byte(DeviceAddress+1);//Read

ack();

data=Read_Byte();

//NO ACK

stop();

return data;

}

/******************************sn8p_eeprom.c END*********************************/