104
Chapter 3
CPU Function
Preliminary User’s Manual U15839EE1V0UM00
3.6.1 Command
Register
(PRCMD)
This command register (PRCMD) is to protect the registers that may have a significant influence on the
application system (PSC, PSM) from an inadvertent write access, so that the system does not stop in
case of a program hang-up.
This register can only be written in 8-bit units (undefined data is used when this register is read).
Only the first write access to a specific on-chip register (hereafter referred to as a “specific register”)
after data has been written to the PRCMD register is valid.
In this way, the value of the specific register can be rewritten only in a specified sequence, and an illegal
write access is inhibited.
Figure 3-17:
Command Register (PRCMD) Format
REG7 to REG0: registration code (any 8-bit data)
Caution:
The register must be written with store instruction execution by CPU. DMA transfer is
prohibited.
7
6
5
4
3
2
1
0
Address
R/W
At Reset
PRCMD
REG7
REG6
REG5
REG4
REG3
REG2
REG1
REG0
FFFFF1FCH
R/W
xxH
Содержание mPD703128
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