4.8.6.2 Low-Power Mode Pin Control

The SHDWC manages the LPM pin which is used to indicate to an external power supply to enter or exit a special powering state. The LPM pin can be configured by software.

To configure LPM with software:

Set SHDWC_CR.LPMEN to set LPM 'high' (VBAT level).
Set SHDWC_CR.LPMDIS to set LPM 'low' (VBAT level).

Writing both SHDW_CR.LPMEN and SHDW_CR.LPMDIS has no effect.

By default, at the first power-up, LPM starts at low level.

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