7.3.7 Reset and Power-Down

The RST pin functions as both a hardware reset and a power-down. When the pin is brought low a reset is issued, restoring all device components to their default state. While the pin is kept low, the device is in a power-down state where the internal reference is disabled, the modulator and demodulator or encoder and decoder are disabled, serial data output lines are high-impedance, MOD_OUT impedance is set to 70 kΩ, and the clock output is disabled. If an external crystal oscillator is used, the crystal oscillator circuit remains active to reduce start-up time when exiting the power-down state. Clock configuration pins remain active in power-down allowing the crystal oscillator to be disabled if desired.