Nios II Classic Processor Reference Guide

ID 683620
Date 10/28/2016
Document Table of Contents The WR Flag

Setting the WR flag signifies that an MPU region write operation should be performed when a wrctl instruction is issued to the mpuacc register. Refer to the MPU Region Read and Write Operations section for more information. The WR flag always returns 0 when read by a rdctl instruction.
Note: Setting both the RD and WR flags to one results in undefined behavior.