README.md

the deepest slumber

This example serves to show how to put the CH32V003 into its lowest power state (standby) and have it wake periodically.

Power consumption should be around 10uA.

The MCU only toggles the LED and prints a message, then it goes to sleep.
The LED staying on demonstrates that GPIO keeps its state even when the rest of the mcu is in a coma.

Based on the groundwork of Marek M.

time calculations

The autowakeup delay can be calculated by:

t = AWUWR / (fLSI / AWUPSC)

Where AWUWR can be 1 to 63, fLSI is always 128000 and AWUPSC, for practical purposes is 2048, 4096, 10240 or 61440, though lower values are possible.
The maximum autowakeup delay is 30s.