PORT_PTCR
__raw_writew(0x0001, PORT_PTCR); /* 00 00 00 00 00 00 00 01 */
data = __raw_readw(PORT_PTCR);
__raw_writew((data & 0xfc03), PORT_PTCR);
data = __raw_readw(PORT_PTCR);
__raw_writew((data & 0xffc3), PORT_PTCR);