Pll Control Register 0 (Plc0) - Renesas M16C/64A Series User Manual

M16C/64A Group
8.2.6

PLL Control Register 0 (PLC0)

PLL Control Register 0
b7 b6 b5 b4 b3 b2 b1
Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting this register.
PLC02 to PLC00 (PLL multiplying factor select bit) (b2-b0)
Write to bits PLC00 to PLC02 when the PLC07 bit is 0 (PLL off).
When the PM21 bit in the PM2 register is 1 (clock change disabled), writing to bits PLC02 to PLC00 has
no effect.
PLC05 and PLC04 (Reference frequency counter set bit) (b5-b4)
Write to bits PLC05 and PLC04 when the PLC07 bit is 0 (PLL off).
When the PM21 bit in the PM2 register is 1 (clock change disabled), writing to bits PLC05 and PLC04
has no effect.
PLC07 (Operation enable bit) (b7)
When the PM21 bit in the PM2 register is 1 (clock change disabled), writing to the PLC07 bit has no
effect.
R01UH0136EJ0210 Rev.2.10
Jul 31, 2012
Symbol
b0
PLC0
Bit Symbol Bit Name
PLC00
PLL multiplying factor
PLC01
select bit
PLC02
—
Reserved bit
(b3)
PLC04
Reference frequency counter
set bit
PLC05
—
No register bit. If necessary, set to 0. The read value is undefined.
(b6)
PLC07 Operation enable bit
Address
001Ch
Function
b2 b1 b0
0 0 0 : Do not set
0 0 1 : Multiply-by-2
0 1 0 : Multiply-by-4
0 1 1 : Multiply-by-6
1 0 0 : Multiply-by-8
1 0 1 :
1 1 0 : Do not set these values
1 1 1 :
The read value is undefined
b5 b4
0 0 : No division
0 1 : Divide-by-2
1 0 : Divide-by-4
1 1 : Do not set
0 : PLL off
1 : PLL on
8. Clock Generator
Reset Value
0X01 X010b
RW
RW
RW
RW
RO
RW
RW
—
RW
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