The following registers cannot be rewritten in ROM P/E mode or E2 DataFlash P/E mode. Switch to ROM read mode to rewrite.
- System clock control register (SCKCR)
- System clock control register 2 (SCKCR2)
- System clock control register 3 (SCKCR3)
- External bus clock control register (BCKCR)
- Operating power control register (OPCCR)
For details, please refer to the respective register descriptions in the user's manual: hardware.