Access Control Register. Writing the ACTRL register with the following values in the order shown, allows read and write access to the system and user Information block: pflc-actrl = 0x3a7f5ca3; pflc-actrl = 0xa1e34f20; pflc-actrl = 0x9608b2c1. When unlocked, a write of any word will disable access to system and user information block. Readback of this register is always zero.
ACTRL | Access control. |