Renesas M16C Series User Manual

Protect
M30240 Group
Rev.1.00 Sep 24, 2003 Page 141 of 360
Figure 2.2: Set-up procedure for protect function
(1) Clearing the protect (set to write-enabled state)
Protect register [Address 000A 16]
PRCR
Enables writing to system clock control registers 0 and 1 (addresses 0006 16 and 000716)
and frequency synthesizer registers (address 03DB16 to 03DF16).
1 : Write-enabled
Enables
writing to processor mode registers 0 and 1
0 : Write-inhibited
1 : Write-enabled
b7 b0
1
Set system clock control register 0 and 1 and frequency synthesizer registers
(2)
0
(5)
Set processor mode register 0 and 1
Reserved bit
(3) Setting
the protect (set to write-inhibited state)
Protect register [Address 000A 16]
PRCR
Enables writing to system clock control registers 0 and 1 (addresses 0006 16 and 000716)
and frequency synthesizer registers (address 03DB16 to 03DF16).
0 : Write-inhibited
Enables
writing to processor mode registers 0 and 1
0 : Write-inhibited
1 : Write-enabled
b7 b0
0
Reserved bit
0
(4) Clearing
the protect (set to write-enabled state)
Protect register [Address 000A16]
PRCR
Enables writing to system clock control registers 0 and 1 (addresses 0006 16 and 000716)
and frequency synthesizer registers (address 03DB16 to 03DF16).
0 : Write-inhibited
Enables
writing
to
processor mode registers 0 and 1
1 : Write-enabled
b7 b0
0
Reserved bit
1
1 : Write-enabled
(6) Setting the protect (set to write-inhibited state)
Protect register [Address 000A16]
PRCR
Enables writing to system clock control registers 0 and 1 (addresses 0006 16 and 000716)
and frequency synthesizer registers (address 03DB16 to 03DF16).
0 : Write-inhibited
Enables
writing
to
processor mode registers 0 and 1
b7 b0
0
Reserved bit
1 : Write-enabled
0
0 : Write-inhibited

Renesas M16C Series Specifications

General

Brand	Renesas
Model	M16C Series
Category	Computer Hardware
Language	English