m30262f8gp Renesas Electronics Corporation., m30262f8gp Datasheet - Page 47

• Manufacturer Part Number: m30262f8gp
• Description: Renesas 16-bit Cmos Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

Power Control
Power control
Modes
Table 1.8.4. Oscillation state in each mode
The following is a description of the three available power control modes:
Power control is available in three modes.
Figure 1.8.8 is the state transition diagram of the above modes.
(a) Normal operation mode
(b) Wait mode
(c) Stop mode
M
H
L
L
R
R
f
i d
e r
o
o
• High-speed mode
• Medium-speed mode
• Low-speed mode
• Low power dissipation mode
• Ring oscillator mode
• Ring oscillator low power dissipation mode
The CPU operation is stopped. The oscillators do not stop.
All oscillators stop. The CPU and all built-in peripheral functions stop. This mode, among the three
modes listed here, is the most effective in decreasing power consumption.
g i
n i
n i
e
s s
w
w
q
Divide-by-1 frequency of the main clock becomes the BCLK. The CPU operates with the BCLK.
Each peripheral function operates according to its assigned clock.
Divide-by-2, divide-by-4, divide-by-8, or divide-by-16 frequency of the main clock becomes the BCLK.
The CPU operates with the BCLK. Each peripheral function operates according to its assigned clock.
f
subclock. Each peripheral function operates according to its assigned clock.
The main clock operating in low-speed mode is stopped. The CPU operates according to the f
clock. The f
those with the subclock selected as the count source.
The ring oscillator clock divided by 1 (undivided), 2, 4, 8, or 16 provides BCLK. The ring oscillator
clock is also 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.
The main clock is turned off after being placed in ring oscillator mode. The CPU clock can be selected as
in the ring oscillator mode. The ring 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. When the operation
mode is returned to the high and medium speed modes, set the CM06 bit to “1” (divided by 8 mode).
d
/ h
g
g
C
u
s -
p i
u i
p
e
m
o
o
t a
p
o
becomes the BCLK. The CPU operates according to the f
m
n
c s
c s
e
e
w
y c
o i
s -
d
e
Preliminary Specifications Rev. 0.9
r e
l l i
l l i
n
u i
d
p
t a
t a
a
Specifications in this manual are tentative and subject to change.
e
m
m
i d
m
t f
r o
r o
e
r e
s -
s s
o
o
d
d
d
m
o l
p
p i
m
e r
e
e
e
w
o
t a
o
e
s
d
d
d
p
t e
o i
e
C
e
o
n
w
e r
d (
clock is supplied by the subclock. The only peripheral functions that operate are
m
r e
e l
v i
o
a
d i
d
s
- e
e
e
) d
y b
8 -
O
B
B
/ N
O
O
X
O
C
C
F
F
N I
O
N
L
L
F
F
K
K
F
Renesas Technology Corp.
F
O
O
O
B
B
X
/ N
/ N
/ N
O
C
C
C
F
O
O
O
L
L
N I
F
K
K
F
F
F
F
F
F
O
B
B
/ N
R
O
O
O
C
C
n i
F
F
F
O
L
L
F
F
F
g
F
K
K
F
C
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
clock. The f
C
clock is supplied by the
M16C/26 Group
C
41