TCON_CH1_SCLK1_HALF_BIT
if (reg & TCON_CH1_SCLK1_HALF_BIT)
reg &= ~(TCON_CH1_SCLK2_DIV_MASK | TCON_CH1_SCLK1_HALF_BIT);
reg |= TCON_CH1_SCLK1_HALF_BIT;