RTW_TCR_SRL_MASK
tcr &= ~(RTW_TCR_SRL_MASK|RTW_TCR_LRL_MASK);
tcr |= LSHIFT(4, RTW_TCR_SRL_MASK) | LSHIFT(4, RTW_TCR_LRL_MASK);
LSHIFT(7, RTW_TCR_SRL_MASK) | LSHIFT(7, RTW_TCR_LRL_MASK);