M32C80 Datasheet, PDF (333/352 Pages) Renesas Technology Corp – 16/32-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M32C/80 SERIES

M32C/80 Group
24. Precautions (Protection)
24.5 Protection
The PRC2 bit setting in the PRCR register is changed to "0" (write disabled) when an instruction is written
to any address after the PRC2 bit is set to "1" (write enabled). Write instruction immediately after setting the
PRC2 bit to "1" to change registers protected by the PRC2 bit. Do not generate an interrupt or a DMA
transfer between the instruction to set the PRC2 bit to "1" and the following instruction.
Rev. 1.00 Nov. 01, 2005 ^{Page 314} of 330
REJ09B0271-0100