/* --- STC12C5Axx Series MCU Power-Down wakeup by RXD Demo ---------*/


#include "reg51.h"
#include "intrins.h"

typedef unsigned char BYTE;
typedef unsigned int WORD;

/*Declare SFR associated with the PCA */
sfr WAKE_CLKO   =   0x8F;

void uart_isr() interrupt 4 using 1
{
    if (RI)
    {
        RI = 0;
    }
}

void main()
{
    WAKE_CLKO = 0x40;               //enable RXD falling edge wakeup MCU from power-down mode
    ES = 1;
    EA = 1;

    while (1)
    {
        RXD = 1;                    //ready read RXD port
        while (!RXD);               //check RXD
        _nop_();
        _nop_();
        PCON = 0x02;                //MCU power down
        _nop_();
        _nop_();
        P2++;
    }
}