I would like to ask a few questions about the PMU_CTRL_REG PERPH_SLEEP,
Q1: Datasheet says that I2C,UART,SPI,ADC goes to power down. Does "power down" mean if the clock of those blocks are
stoppped? or power supply to those blocks is gated and will have power on reset when it wakeup from extended sleep?
Q2: This operation is also applied to the GPIO block?
Q3: How about IO buffer's behavior which are configured as GPIO? IO buffers' level are kept before and after wakeup from