m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 14

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Operation
Figure 2.1.2. Set-up procedure for protect function
2.1.2 Protect Operation
The following explains the protect operation. Figure 2.1.2 shows the set-up procedure.
b7
b7
(1) Clearing the protect (set to write-enabled state)
(3) Setting the protect (set to write-inhibited state)
(1) Setting “1” in the write-enable bit of system clock control registers 0 and 1 and frequency
(2) The contents of system clock control register 0 and 1 and these of frequency synthesizer-
(3) Setting “0” in PRC0 causes system clock control register 0 and 1 and frequency synthesizer-
(4) To change the contents of processor mode register 0 and that of processor mode register 1,
(2) Setting system clock control register i (i = 0, 1)
synthesizer-related registers causes system clock control register 0 and 1 and frequency
synthesizer-related registers to be in write-enabled state.
related registers are changed.
related registers to be in write-inhibited state.
follow the same steps as in dealing with system clock control registers and frequency synthe-
sizer-related registers.
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0
0
b0
b0
1
0
Enables writing to system clock control registers 0 and 1 (addresses 0006
0007
Enables writing to system clock control registers 0 and 1 (addresses 0006
0007
1 : Write-enabled
0 : Write-inhibited
Protect register [Address 000A
PRCR
Protect register [Address 000A
PRCR
16
16
)
)
and frequency synthesizer-related registers (address 03DB
and frequency synthesizer-related registers (address 03DB
16
16
]
]
16
16
to 03DF
to 03DF
16
16
and
and
16
16
2. Protect
)
)