31.1.4 FCW Write Flow

The address for erases and the address/data for word writes is stored by the CPU in the Special Function Registers (SFRs) of the FCW. The CPU stores this data using Peripheral Bus A. Flash operations are executing using the FCR (Flash Controller, Read).

Row writes of Flash do not use data already stored in the FCW’s registers. Instead the data is read directly from data RAM using the AHB bus matrix.