TCNT
return ~(_reg_read_4(TCNT));
_reg_write_4(TCNT, 0xffffffff);
_reg_write_4(SH_(TCNT ## x), 0xffffffff); \
(0xffffffff - _reg_read_4(SH_(TCNT ## x)))
cnt = bus_space_read_4(iot, ioh, TUL_STCNT0) & TCNT;