M16C65 Datasheet, PDF (171/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
9. Power Control
9.3.2 Mode Transitions
Figure 9.1 shows Clock Mode Transition. Arrows indicate that mode transitions are enabled between
modes.
Normal Operating
Mode
c
PLL operating mode
b
Reset
Transitions to
wait mode and stop mode enabled
40 MHz on-chip
oscillator mode
da
i
g
125 kHz on-chip
oscillator mode
h
d
e
e
f
125 kHz on-chip
oscillator low power
mode
High-speed,
medium-speed
mode
a
f
a
g
Low-speed mode
h
Low power mode
Interrupt
or
reset
WAIT instruction
Wait mode
CPU operation stop
Interrupt
or
reset
CM10 = 1
Stop mode
All oscillations stop
CM10 : Bit in the CM1 register
Figure 9.1 Clock Mode Transition
To start or stop clock oscillations, or to change modes in normal operating mode, follow the instructions
below.
• Enter a mode after the clock for the mode entered stabilizes completely.
• To stop a clock, stop the clock for the mode exited after mode transition is completed. Do not stop
the clock at the same time as mode transition.
• Execute mode transition according to the following procedures. To access registers and bits, see
9.2 “Registers”. Letters a to h correspond to those in Figure 9.1 “Clock Mode Transition”.
• For oscillation start and stop, see 8.3.1 “Main Clock” to 8.3.6 “Sub Clock (fC)”.
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
Page 136 of 791