UPD70F3786GJ-GAE-AX Datasheet, PDF (102/1817 Pages) Renesas Technology Corp – RENESAS MCU V850ES/Jx3-E Microcontrollers

V850ES/JH3-E, V850ES/JJ3-E
CHAPTER 3 CPU FUNCTION
(2) Command register (PRCMD)
The PRCMD register is an 8-bit register that protects the registers that may seriously affect the application system
from being written, so that the system does not inadvertently stop due to a program hang-up. The first write access
to a special register is valid after data has been written in advance to the PRCMD register. In this way, the value of
the special register can be rewritten only in a specific sequence, so as to protect the register from an illegal write
access.
The PRCMD register is write-only, in 8-bit units (undefined data is read when this register is read).
After reset: Undefined W Address: FFFFF1FCH
7
PRCMD REG7
6
REG6
5
REG5
4
REG4
3
REG3
2
REG2
1
REG1
0
REG0
R01UH0290EJ0300 Rev.3.00
Sep 19, 2011
Page 102 of 1817