M16C/62P Group (M16C/62P, M16C/62PT)
10. Clock Generation Circuit
Rev.2.41
Jan 10, 2006
Page 95 of 390
REJ09B0185-0241
10.4.1.7
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 as 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 on, fC32 can be used as the count source for Timers A and B.
−
: “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 CM06 bit is set to “1” (divided by 8 mode) simultaneously.
2. The divide-by-n value can be selected the same way as in on-chip oscillator mode.
Table 10.3
Setting Clock Related Bit and Modes
Modes
CM2
Register
CM1 Register
CM0 Register
CM21
CM11
CM17, CM16
CM07
CM06
CM05
CM04
PLL Operating Mode
0
1
00b
0
0
0
−
High-Speed Mode
0
0
00b
0
0
0
−
Medium-
Speed Mode
divided by 2
0
0
01b
0
0
0
−
divided by 4
0
0
10b
0
0
0
−
divided by 8
0
0
-
0
1
0
−
divided by 16
0
0
11b
0
0
0
−
Low-Speed Mode
−
0
−
1
−
0
1
Low Power Dissipation Mode
0
0
−
1
1
(1)
1
(1)
1
On-chip
Oscillator
Mode
divided by 1
1
0
00b
0
0
0
−
divided by 2
1
0
01b
0
0
0
−
divided by 4
1
0
10b
0
0
0
−
divided by 8
1
0
−
0
1
0
−
divided by 16
1
0
11b
0
0
0
−
On-chip Oscillator Low Power
Dissipation Mode
1
0
(NOTE 2)
0
(NOTE 2)
1
−
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