RL78 Family VDE Certified IEC60730/60335 Self Test Library
R01AN0749EG0201 Rev.2.01 Page 47 of 50
Mar 04, 2014
6.1.6 Control Register Protection
This is a write protection feature that prohibits a write to the control registers. No error is generated if a write
occurs to this area, but the write operation does not change the state of the registers involved. The protection
can be turned off, if a change is required for the SFR registers or for safety reasons the SFR settings are
refreshed by the application.
The following control registers can be protected with this function
CMC, CSC, OSTS, CKC, PERx, OSMC, LVIM, LVIS, and RPECTL
The interrupt SFR registers can be guarded by the āGCSCā bit as shown in figure 26 below
Figure 26 Invalid Memory Access Protection
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