M16C6S_09 Datasheet, PDF (30/208 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6S Group
Clock Generation Circuit
System clock control register 1 (Note 1)
b7 b6 b5 b4 b3 b2 b1 b0
1 00 00
Symbol
CM1
Address
000716
After reset
001000002
Bit symbol
Bit
Function
RW
CM10
All clock stⁿo^ap^mco^entrol bit
(Notes 3, 4)
0 : Clock on
1 : All clocks off (stop mode)
RW
(b4-b1) ^{Reserved bit}
Must set to “0”
RW
(b5)
Reserved bit
Must set to “1”
RW
b7 b6
CM16 ^{Main clock division}
0 0 : No division mode
RW
select bit 1 (Note 2)
0 1 : Division by 2 mode
CM17
1 0 : Division by 4 mode
1 1 : Division by 16 mode
RW
Note 1: Write to this register after setting the PRC0 bit of PRCR register to “1” (write enable).
Note 2: Effective when the CM06 bit is “0” (CM16 and CM17 bits enable).
Note 3: When the CM20 bit of CM2 register is set to “1” (oscillation stop, re-oscillation detection function enabled), do not set the
CM10 bit to “1”.
Note 4: When the PM21 bit of PM2 register is set to “1” (clock modification disable), writing to the CM10 bits has no effect.
When the PM22 bit of PM2 register is set to “1” (watchdog timer count source is On-chip Oscillator clock), writing to the CM10 bit
has no effect.
Figure 1.7.3. CM1 Register
Rev.5.01 Dec 10, 2009 page 30 of 201
REJ03B0014-0501