M-V850E-IA4 Renesas Electronics America, M-V850E-IA4 Datasheet - Page 80

• Manufacturer Part Number: M-V850E-IA4
• Description: KIT EVAL V850E IA4 UPD70F3186
• Manufacturer: Renesas Electronics America

Specifications of M-V850E-IA4

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
An illegal write operation to a special register can be checked by using the SYS.PRERR bit.
The PRCMD register is write-only, in 8-bit units (undefined data is read when this register is read).
Reset makes this register undefined.
After reset: Undefined
W
Address:
FFFFF1FCH
7
6
5
4
3
2
1
0
PRCMD
REG7
REG6
REG5
REG4
REG3
REG2
REG1
REG0
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User’s Manual U16543EJ4V0UD