/* --- STC12C5Axx Series Programmable Clock Output Demo ------------*/


#include "reg51.h"

//-----------------------------------------------

/* define constants */
#define FOSC 11059200L
//#define MODE1T                      //Timer clock mode, comment this line is 12T mode, uncomment is 1T mode

#ifdef MODE1T
#define F38_4KHz (256-FOSC/2/38400)    //38.4KHz frequency calculation method of 1T mode
#else
#define F38_4KHz (256-FOSC/2/12/38400) //38.4KHz frequency calculation method of 12T mode
#endif

/* define SFR */
sfr AUXR      = 0x8e;               //Auxiliary register
sfr WAKE_CLKO = 0x8f;               //wakeup and clock output control register
sfr BRT       = 0x9c;
sbit BRTCLKO  = P1^0;               //BRT clock output pin

//-----------------------------------------------

/* main program */
void main()
{
#ifdef MODE1T
    AUXR = 0x04;                    //BRT work in 1T mode
#endif
    BRT = F38_4KHz;                 //initial BRT
    AUXR |= 0x10;                   //BRT start running
    WAKE_CLKO = 0x04;               //enable BRT clock output

    while (1);                      //loop
}