LPCR_SRTC_ENV
sc->lpcr &= ~LPCR_SRTC_ENV;
enbit = sc->lpcr & LPCR_SRTC_ENV;
while ((RD4(sc, SNVS_LPCR) & LPCR_SRTC_ENV) != enbit)
if (!(RD4(sc, SNVS_LPCR) & LPCR_SRTC_ENV)) {
sc->lpcr |= LPCR_SRTC_ENV;