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M16C/6N Group (M16C/6NK, M16C/6NM)
8.4.1.6 On-chip Oscillator Mode
The on-chip oscillator clock divided by 1 (undivided), 2, 4, 8 or 16 provides the CPU clock. The on-chip
oscillator clock is also the clock source for the peripheral function clocks. If the sub clock is activated,
fC32 can be used as the count source for timers A and B. When the operation mode is returned to the
high- and medium-speed modes, set the CM06 bit in the CM0 register to "1" (divide-by-8 mode).
8.4.1.7 On-chip Oscillator Low Power Dissipation Mode
The main clock is turned off after being placed in on-chip oscillator mode. The CPU clock can be
selected like in the on-chip oscillator mode. The on-chip oscillator clock is the clock source for the
peripheral function clocks. If the sub clock is activated, fC32 can be used as the count source for timers
A and B.
Table 8.3 lists the setting clock related bit and modes.
Table 8.3 Setting Clock Related Bit and Modes
CM2 Register
Modes
PLL Operation Mode
High-Speed Mode
Medium- Divide-by-2
Speed
Divide-by-4
Mode
Divide-by-8
Divide-by-16
Low-Speed Mode
Low Power
Dissipation Mode
On-chip Divide-by-1
Oscillator Divide-by-2
Mode
Divide-by-4
Divide-by-8
Divide-by-16
On-chip Oscillator
Low power Dissipation
Mode
-: "0" or "1"
NOTES:
1. When the CM05 bit is set to "1" (main clock turned off) in low-speed mode, the mode goes to low power
dissipation mode and the CM06 bit is set to "1" (divide-by-8 mode) simultaneously.
2. The divide-by-n value can be selected the same way as in on-chip oscillator mode.
Rev.2.00
Nov 28, 2005
REJ09B0124-0200
CM1 Register
CM21
CM11
CM17, CM16
0
1
0
0
0
0
0
0
0
0
0
0
-
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
page 70 of 378
CM07
00b
0
00b
0
01b
0
10b
0
-
0
11b
0
-
1
-
1
00b
0
01b
0
10b
0
-
0
11b
0
(NOTE 2)
0
8. Clock Generating Circuit
CM0 Register
CM06
CM05
0
0
0
0
0
0
0
0
1
0
0
0
-
0
(1)
(1)
1
1
0
0
0
0
0
0
1
0
0
0
(NOTE 2)
1
CM04
-
-
-
-
-
-
1
1
-
-
-
-
-
-
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