21.1.2 Field Write Protect

Many System Registers contain fields of multiple bits. A Field Write Protect bit provides write protection for an entire field within a single register as shown in the following figure. Field Write Protect bits follow the same rules as Register Write Protect bits described in 21.1.1 Register Write Protect, but are instead applied to each individual field within the register. There is a Field Write Protect bit allocated for each field within the register.