TMR_GBL_CTL
a9tmr_global_write(sc, TMR_GBL_CTL, TMR_CTL_ENABLE);
uint32_t ctl = a9tmr_global_read(sc, TMR_GBL_CTL);
a9tmr_global_write(sc, TMR_GBL_CTL,
a9tmr_global_write(sc, TMR_GBL_CTL, ctl);
a9tmr_global_read(sc, TMR_GBL_CTL),