Precautions For Protection - Renesas M16C/60 Series Hardware Manual

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M16C/6N5 Group

1.4 Precautions for Protection

Set the PRC2 bit to "1" (write enabled) and then write to any address, and the PRC2 bit will be set to "0"
(write protected). The registers protected by the PRC2 bit should be changed in the next instruction after
setting the PRC2 bit to "1". Make sure no interrupts or no DMA transfers will occur between the instruction
in which the PRC2 bit is set to "1" and the next instruction.
Rev.1.00 2003.05.30 page 4
1.4 Precautions for Protection