RL78F13 UART connection

Hi Team,

I have UART connection problem in R-Car-V4H MCU RL78/F13.

I can't receive the correct data when the MCU sends buffer data('a') via UART.

If your have a sample code, please provide it to me, thank you!

uint8_t tx_buf[] = {'a'};

void clock_sleep(long d)
{
	while(d--);
}

void main(void)
{	
    R_MAIN_UserInit();
    
    R_UART0_Start();
    
    while (1)
    {
		R_UART0_Send(tx_buf, 1);
	    clock_sleep(1000000);
    }
}

void R_MAIN_UserInit(void)
{
    EI();
}

Thanks!

Louis,