M16C26A Datasheet, PDF (61/352 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/26A Group (M16C/26A, M16C/26B, M16C/26T)
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}
b2 b1b0
0 0 0: Do not set
RW
select bit
(3)
0 0 1: Multiply by 2
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
Must set to "1"
RW
(b4)
Reserved bit
Must set to "0"
RW
(b6-b5)
PLC07 ^{Operation enable bit}
(4)
0: PLL Off
1: PLL On
RW
NOTES:
1. Write to this register after setting the PRC0 bit in the 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 and 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 Feb.15, 2007 ^{page 44} of 329
REJ09B0202-0200