MCCHIPREG_TIMER4_CTRL
pcc2_reg_write(sys_pcctwo, MCCHIPREG_TIMER4_CTRL, 0);
pcc2_reg_write(sc, MCCHIPREG_TIMER4_CTRL, 0);
pcc2_reg_write(sys_pcctwo, MCCHIPREG_TIMER4_CTRL, PCCTWO_TT_CTRL_CEN);