116
Chapter 3
CPU Function
Preliminary User’s Manual U14913EE1V0UM00
3.5.1 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.
REG7-0: registration code (any 8-bit data)
Remark:
The registers must be written with store instruction execution by CPU. DMA transfer is pro-
hibited.
3.5.2 Peripheral Command Register (PHCMD)
This command register (PHCMD) is to protect the registers that may have a significant influence on the
application system (CKC) from an inadvertent write access, so that the system does not stop in case of
a program hang-up.
This register can be only 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 PHCMD 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.
REG7-0: registration code (any 8-bit data)
Remark:
The registers must be written with store instruction execution by CPU. DMA transfer is pro-
hibited.
If an illegal store operation takes place, it can be checked by the PRERR flag of the peripheral status
register (PHS).
Remark:
Write to this registers by 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
7
6
5
4
3
2
1
0
Address
R/W
At Reset
PHCMD REG7
REG6
REG5
REG4
REG3
REG2
REG1
REG0
FFFFF800H
R/W
xxH
Содержание V850E/CA1 ATOMIC
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