6.3 Standby (STBY) Pin

The STBY pin is an input. It must be driven high to enable Sleep mode, while keeping the Reset (NRST) pin enabled (driven low).

By default, the STBY pin must be connected to GND to prevent device malfunction caused by an undefined status of the PLC line driver pins. If Sleep mode is required, the STBY pin may be managed accordingly.

In Sleep mode, the core of the device and the peripherals are reset, reducing power consumption. The content of the RAM memory is maintained. Therefore, the program reloading is not required when the PL460 returns to normal operating mode.

To avoid device malfunction in Sleep mode due to an undefined status of the PLC line driver pins, the STBY pin only must be enabled (driven high) after the NRST is enabled (driven low). To exit Sleep mode, it is required to disable the STBY pin (driven low) first and then, disable NRST (driven high).

When using the Sleep mode functionality, the NRST and STBY signals must be connected to a GPIO in the host controller with an internal pull-down default reset configuration to avoid enabling Sleep mode until the host boots.