[64] REGULATORS: VREGMAIN has invalid configuration when CPU is running

This anomaly applies to IC Rev. Engineering A, build codes QKAA-AB0.

Domains

Application

Symptoms

The voltage on the DECD pin drops which can trigger a reset of the device.

Conditions

DC/DC mode is enabled in the VREGMAIN regulator and CPU is running.

Consequences

DC/DC mode cannot be enabled in the VREGMAIN regulator when CPU is running.

Workaround

Apply the following code after any reset: 
 
*((volatile uint32_t *)0x5000470Cul) =0x29ul;
*((volatile uint32_t *)0x5000473Cul) =0x3ul;
This workaround is implemented in MDK version 8.30.0 and later.
Parent topic: New and inherited anomalies