M16C6S_09 Datasheet, PDF (41/208 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6S Group
Clock Generation Circuit
Figure 1.7.7 shows the state transition from normal operation mode to stop mode and wait mode.
Reset
All oscillators stopped
CM10=1
Stop mode
Interrupt
Interrupt
Stop mode
CM10=1
Stop mode
CM10=1
Interrupt
(Note 2)
Medium-speed mode
(divided-by-8 mode)
High-speed, medium-
speed mode
On-chip Oscillator mode
Normal mode
WAIT
instruction
(Note 1)
Interrupt
WAIT
instruction
(Note 1)
Interrupt
WAIT
instruction
(Note 1)
Interrupt
CPU operation stopped
Wait mode
Wait mode
Wait mode
Note 1: When the PM21 bit = 0 (system clock protective function unused).
Note 2: The On-chip Oscillator clock divided by 8 provides the CPU clock.
Note 3: Write to the CM0 register and CM1 register simultaneously by accessing in word units while CM21=0 (On-chip Oscillator turned off).
Figure 1.7.7. State Transition to Stop Mode and Wait Mode
Rev.5.01 Dec 10, 2009 page 41 of 201
REJ03B0014-0501