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Chapter 3
CPU Function
User’s Manual U16702EE3V2UD00
3.2.3 Special
registers
Special registers are registers that are protected from being written with illegal data due to a program
hang-up.
The V850E/RS1 has the following special registers.
•
Power save control register (PSC)
•
Clock control register (CKC)
•
Main peripheral clock control register (MPCCTL)
•
Processor clock control register (PCC)
•
Clock monitor mode register (CLM)
•
Reset control flag register (RESF)
•
Low-voltage detection register (LVIM)
•
Internal RAM data status register (RAMS)
•
On-chip debug mode setting register (OCDM)
In addition, a command register (PRCMD) is provided to protect against a write access to the special
registers so that the application system does not inadvertently stop due to a program hang-up. A write
access to the special registers is made in a specific sequence, and an illegal store operation is reported
to the system status register (SYS).
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