SM502_uC_MODE_SELECT
v = VAC_READ(sc, SM502_uC_MODE_SELECT);
VAC_WRITE(sc, SM502_uC_MODE_SELECT, v);
VAC_READ(sc, SM502_uC_MODE_SELECT),
VAC_WRITE(sc, SM502_uC_MODE_SELECT,
VAC_READ(sc, SM502_uC_MODE_SELECT) & ~SM502_uC_CODEC_I2S);