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通電后進入掉電模式，電流大概4uA，
按鍵后，中斷喚醒，電流大概30mA，
然后！！！！！
理論上講這時候應該重新變成掉電模式的4uA
但是用萬用表測電流發現，電流從30mA跳到28mA后，以0.1mA每秒的速度往下掉
這是為什么呀？
單片機源程序如下:
unsigned char key0 = 1;
unsigned char key1 = 1;
unsigned char key_tc = 1;
/**************中斷******************/
void INT0_Routine()interrupt 0 //左邊key0
{
PCON = 0x00;
key1 = 0;
}
void INT1_Routine()interrupt 2 //右邊key1
{
key0 = 0;
}
void INT3_Routine()interrupt 11
{
key_tc = 0;
}
/**************主程序****************/
void main()
{
P1M1 = 0xCF; // 1.7，1.6，1.3，1.2，1.1，1.0高阻輸入
P1M0 = 0x00; //
P3M1 = 0x0C; // key1和key2高阻輸入
P3M0 = 0x00;
IT0 = 1; //使能INT0下降沿中斷
EX0 = 1; //使能INT0中斷
IT1 = 1; //使能INT1下降沿中斷
EX1 = 1; //使能INT1中斷
INTCLKO = 0x20; //使能INT3下降沿中斷
ES = 1; //使能串口中斷
EA = 1;
led = 1;
PCON = 0x02; //掉電模式，低功耗模式
while(1)
{
if(key_tc == 0)
{
led = 0;
Delay30ms(); //按鍵防抖
up();
read_id();
Delay30ms();
led = 1;
key_tc = 1;
PCON = 0x02;
}
if(key0 == 0)
{
led = 0;
Delay30ms(); //按鍵防抖
up();
Delay30ms();
led = 1;
key0 = 1;
PCON = 0x02;
}
if(key1 == 0)
{
led = 0;
Delay30ms(); //按鍵防抖
down();
Delay30ms();
led = 1;
key1 = 1;
PCON = 0x02;
}
}
}
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