M16C28 Datasheet, PDF (70/423 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/28 Group (M16C/28, M16C/28B)
7. Clock Generation Circuit
PLL Control Register 0 ^(1,2)
b7 b6 b5 b4 b3 b2 b1 b0
00 1
Symbol
PLC0
Address
001C16
After Reset
0001 X0102
Bit
Symbol
Bit Name
Function
RW
PLC00
PLL multiplying factor
select bit
(3)
b2 b1b0
0 0 0: Do not set
0 0 1: Multiply by 2
RW
0 1 0: Multiply by 4
PLC01
0 1 1:
RW
1 0 0:
1 0 1: Do not set
PLC02
1 1 0:
RW
1 1 1:
Nothing is assigned. When write, set to "0".
(b3) ^{When read, its content is indeterminate.}
Reserved bit
Set to "1"
RW
(b4)
(b6-b5) ^{Reserved bit}
Set to "0"
RW
PLC07
Operation enable bit ⁽⁴⁾
0: PLL Off
1: PLL On
RW
NOTES:
1. Write to this register after setting the PRC0 bit of PRCR register to "1" (write enable).
2. When the PM21 bit in the PM2 register is "1" (clock modification disable), writing to this register has no effect.
3. These three bits can only be modified when the PLC07 bit is set to "0" (PLL turned off). The value once written to
this bit cannot be modified.
4. Before setting this bit to "1" , set the CM07 bit to "0" (main clock), set the CM17 to CM16 bits to "002" (main
clock undivided mode), and set the CM06 bit to "0" (CM16 and CM17 bits enable).
Figure 7.7 PLC0 Register
Rev. 2.00 Jan. 31, 2007 ^{page 50} of 385
REJ09B0047-0200