R01UH0092EJ0110 Rev.1.10
Page 95 of 807
Jul 31, 2012
M16C/64C Group
8. Clock Generator
8.2.7
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.
b7 b6 b5 b4
b1
b2
b3
PLL Control Register 0
Symbol
PLC0
Address
001Ch
Bit Symbol
Bit Name
RW
Reset Value
0X01 X010b
b0
Function
—
(b3)
PLC04
—
PLC05
RW
—
(b6)
PLC07
No register bit. If necessary, set to 0. The read value is undefined.
0 : PLL off
1 : PLL on
Operation enable bit
RO
Reserved bit
The read value is undefined
Reference frequency counter
set bit
b5 b4
0 0 : No division
0 1 : Divide-by-2
1 0 : Divide-by-4
1 1 : Do not set
PLC00
PLL multiplying factor
select bit
PLC01
PLC02
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 :
RW
RW
RW
RW
RW
Содержание M16C Series
Страница 846: ...M16C 64C Group R01UH0092EJ0110...