24.1 Overview

The Peripheral Access Controller (PAC) provides an interface for the locking and unlocking of peripheral registers within the device. It reports all violations that might happen when accessing a peripheral:
  • Write-protected access
  • Illegal access
  • Enable-protected access
  • Access when clock synchronization or software reset is ongoing

These errors are reported in a unique interrupt flag for a peripheral. The PAC module also reports errors occurring at the client bus level when an access to a non-existent address is detected.

Note: The modules attached to the PB-Bridge-D bridge and wireless subsystem, as well as RTCC and DSCON are excluded from PAC. The protection mechanism described in CFG protects critical system registers. See System Configuration and Register Locking (CFG) from Related Links.