Renesas M16C/29 Series Hardware Manual page 74

M16C/29 Group
Figure 7.6.1 shows the state transition from normal operation mode to stop mode and wait mode. Figure
7.6.1.1 shows the state transition in normal operation mode.
Table 7.6.1 shows a state transition matrix describing allowed transition and setting. The vertical line
shows current state and horizontal line shows state after transition.
All oscillators stopped
Stop mode
CM07=0
CM06=1
CM05=0
Stop mode
CM11=0
CM10=1
(Note 5)
Stop mode
Stop mode
Stop mode
Note 1: Do not go directly from PLL operation mode to wait or stop mode.
Note 2: PLL operation mode can be entered from high speed mode. Similarly, PLL operation mode can be changed back to high speed mode.
Note 3: When the PM21 bit = 0 (system clock protective function unused).
Note 4: The on-chip oscillator clock divided by 8 provides the CPU clock.
Note 5: Write to the CM0 register and CM1 register simultaneously by accessing in word units while CM21 = 1 (on-chip oscillator turned off).
When the clock generated externally is input to the X
Note 6: Before entering stop mode, be sure to clear the CM20 bit in the CM2 register to "0" (oscillation stop and oscillation restart detection
function disabled).
Figure 7.6.1. State Transition to Stop Mode and Wait Mode
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
CM10=1
Interrupt
Interrupt
CM10=1
When
low power
dissipation
mode
CM10=1
Interrupt
CM21=0
CM10=1
Interrupt
CM10=1
Interrupt
(Note 4)
page 54 of 402
Normal operation mode
Medium-speed mode
(divided-by-8 mode)
High-speed, medium-
speed mode
Notes 1, 2
When
low-
PLL operation
speed
mode
mode
Low-speed, low power
dissipation mode
On-chip oscillator low power
dissipation mode
On-chip oscillator mode
(selectable frequency)
On-chip oscillator
(ROC)
mode (f /16)
2
Reset
pin, transit to stop mode with this process.
CIN
7. Clock Generation Circuit
WAIT
instruction
Wait mode
Interrupt
WAIT
instruction
Wait mode
Interrupt
WAIT
instruction
Wait mode
Interrupt
CM21=1
WAIT
instruction
Wait mode
Interrupt
WAIT
instruction
Wait mode
Interrupt
CPU operation stopped