Renesas M16C FAMILY series Hardware Manual page 80

M 1 6 C 2 / 8 G o r u p ( M 1 6 C
Figure 7.11 shows the state transition from normal operation mode to stop mode and wait mode. Figure
7.12 shows the state transition in normal operation mode.
Table 7.5 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
(5)
Stop mode
Stop mode
Stop mode
Stop mode
CM05, CM06, CM07: Bits in the CM0 register
CM10, CM11: Bits in the CM1 register
: Arrow shows mode can be changed. Do not change mode to another mode when no arrow is shown.
NOTES:
1. Do not go directly from PLL operation mode to wait or stop mode.
2. PLL operation mode can be entered from high speed mode. Similarly, PLL operation mode can be changed back to high speed mode.
3. When the PM21 bit is set to "0" (system clock protective function unused).
4. The on-chip oscillator clock divided by 8 provides the CPU clock.
5. Write to the CM0 register and CM1 register simultaneously by accessing in word units while CM21 bit is set to "0" (on-chip oscillator
turned off). When the clock generated externally is input to the X
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).
7. The CM06 bit is set to "1" (divide-by-8).
Figure 7.11 State Transition to Stop Mode and Wait Mode
R e . v 2 0 . 0 J a . n 3 , 1 2 0 0 7
R E J 0 9 B 0 0 4 7 0 - 2 0 0
2 / , 8 M 1 6 C 2 / 8 ) B
(6)
CM10=1
Interrupt
Interrupt
CM10=1 (6)
(6)
CM10=1
Interrupt
(6)
CM10=1
Interrupt
CM21=0
CM10=1 (6)
(4)
Interrupt
(6)
CM10=1
Interrupt (4)
page 60
f o 3 8 5
Normal operation mode
Medium-speed mode
(divided-by-8 mode)
High-speed, medium-
speed mode
(1, 2)
PLL operation
mode
Low-speed mode
(7)
Low power dissipation mode
On-chip oscillator low power
dissipation mode
On-chip oscillator mode
(selectable frequency)
On-chip oscillator
mode (f (ROC) /16)
2
Reset
pin, transit to stop mode with this process.
CIN
7. Clock Generation Circuit
CPU operation stopped
WAIT
instruction
Wait mode
Interrupt
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