3. BPGR Retention

3.1. Overview

This example project demonstrates the data retention function of the BPGR register.

3.2. Board Setting

Ensure that the VBAT pin is powered, for example, greater than 3V.

HPM6800EVK has a known issue about VBAT, please refer to Board known issue details

3.3. Running the example

  • When the Retention field of BPOR is initialized and set, the serial terminal will output the following information and the LED will not light up.

bpgr retention example
bpgr retention enable and data initialized, please keep vbat and power down!

  • After power off/on again or press reset. The serial port terminal will output the data retention function verification result. For example, when the verification is successful, the output log is as follows:

bpgr retention example
bpgr data retention success!

  • In addition, the status of the LED light can also indicate the verification result of the data retention function. If the verification is successful, the LED will light up; Otherwise, it will not light up.