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Renesas PCA4738L-64A Información técnica Pagina 47

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
3825 Group
44
Fig. 44 State transitions of internal clock φ
N
otes
1:
S
w
i
tc
h
t
h
e mo
d
e
b
y t
h
e a
ll
ows s
h
own
b
etween t
h
e mo
d
e
bl
oc
k
s.
(D
o not sw
i
tc
h
b
etween t
h
e mo
d
e
di
rect
l
y w
i
t
h
out an a
ll
ow.
)
2: The all modes can be switched to the stop mode or the wait mode and returned to the source mode when the stop mode or the wait
mode is ended.
3: Timer and LCD operate in the wait mode.
4: When the stop mode is ended, a delay of approximately 1 ms occurs automatically by timer 1 and timer 2 in middle-/high-speed mode.
5: When the stop mode is ended, a delay of approximately 0.25 s occurs automatically by timer 1 and timer 2 in low-speed mode.
6: Wait until oscillation stabilizes after oscillating the main clock X
IN
before the switching from the low-speed mode to middle-/high-
speed mode.
7: The example assumes that 8 MHz is being applied to the X
IN
pin and 32 kHz to the X
CIN
pin. f indicates the internal clock.
CM
4
:
P
ort
X
c sw
i
tc
h
bi
t
0: I/O port
1: X
CIN
, X
COUT
CM
5
: Main clock (X
IN
–X
OUT
) stop bit
0: Oscillating
1: Stopped
CM
6
: Main clock division ratio selection bit
0: f(X
IN
)/2 (high-speed mode)
1: f(X
IN
)/8 (middle-speed mode)
CM
7
: Internal system clock selection bit
0: X
IN
–X
OUT
selected
(middle-/high-speed mode)
1: X
CIN
–X
COUT
selected
(low-speed mode)
CPU
mo
d
e reg
i
ster
(CPUM : address 003B
16
)
b
7
b
4
R
e
s
e
t
C
M
6
“0”
“
1
”
C
M
4
“
0
”
“
1
”
C
M
7
=
0
(
8
M
H
z
s
e
l
e
c
t
e
d
)
C
M
6
=
1
(
M
i
d
d
l
e
-
s
p
e
e
d
)
C
M
5
=
0
(
8
M
H
z
o
s
c
i
l
l
a
t
i
n
g
)
C
M
4
=
0
(
3
2
k
H
z
s
t
o
p
p
e
d
)
M
i
d
d
l
e
-
s
p
e
e
d
m
o
d
e
(
f
(
φ
)
=
1
M
H
z
)
C
M
7
=
0
(
8
M
H
z
s
e
l
e
c
t
e
d
)
C
M
6
=
1
(
M
i
d
d
l
e
-
s
p
e
e
d
)
C
M
5
=
0
(
8
M
H
z
o
s
c
i
l
l
a
t
i
n
g
)
C
M
4
=
1
(
3
2
k
H
z
o
s
c
i
l
l
a
t
i
n
g
)
Middle-speed mode (f(
φ
) = 1 MHz)
CM
7
= 0 (8 MHz selected)
CM
6
= 0 (High-speed)
CM
5
= 0 (8 MHz oscillating)
CM
4
= 0 (32 kHz stopped)
High-speed mode (f(
φ
) = 4 MHz)
CM
7
= 0 (8 MHz selected)
CM
6
= 0 (High-speed)
CM
5
= 0 (8 MHz oscillating)
CM
4
= 1 (32 kHz oscillating)
H
i
g
h
-
s
p
e
e
d
m
o
d
e
(
f
(
φ
)
=
4
M
H
z
)
CM
7
= 1 (32 kHz selected)
CM
6
= 1 (Middle-speed)
CM
5
= 0 (8 MHz oscillating)
CM
4
= 1 (32 kHz oscillating)
Low-speed mode (f(
φ
) =16 kHz)
CM
7
= 1 (32 kHz selected)
CM
6
= 0 (High-speed)
CM
5
= 0 (8 MHz oscillating)
CM
4
= 1 (32 kHz oscillating)
Low-speed mode (f(
φ
) =16 kHz)
CM
7
= 1 (32 kHz selected)
CM
6
= 1 (Middle-speed)
CM
5
= 1 (8 MHz stopped)
CM
4
= 1 (32 kHz oscillating)
L
o
w
-
s
p
e
e
d
m
o
d
e
(
f
(
φ
)
=
1
6
k
H
z
)
CM
7
= 1 (32 kHz selected)
CM
6
= 0 (High-speed)
CM
5
= 1 (8 MHz stopped)
CM
4
= 1 (32 kHz oscillating)
Low-speed mode (f(
φ
) =16 kHz)
CM
6
“0”“1”
CM
6
“0”“
1
”
CM
6
“
0
”“1”
C
M
4
“
0
”
“
1
”
C
M
7
“
0
”
“
1
”
C
M
7
“
0
”
“
1
”
C
M
5
“
0
”“
1
”
C
M
5
“
0
”“
1
”
C
M
4
C
M
6
“
0
”
“
1
”
“
0
”
“
1
”
C
M
4
C
M
6
“
0
”
“
1
”
“
1
”
“
0
”
C
M
5
C
M
6
“
0
”
“
1
”
“
0
”
“
1
”
C
M
5
C
M
6
“
0
”
“
1
”
“
1
”
“
0
”
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