參數(shù)資料
型號(hào)： 38C2
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機(jī)
文件頁數(shù)： 50/63頁
文件大小： 1000K
代理商： 38C2
50
38C2 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
Fig. 53 State transitions of system clock
X
I
C
N
M
7
=
o
s
c
0
i
l
l
C
a
t
M
6
=
h
i
o
n
,
1
X
C
I
N
s
t
o
p
,
S
C
y
s
t
e
m
1
c
l
o
C
c
k
M
4
=
φ
:
1
f
(
X
I
N
)
M
5
=
T
r
o
u
g
h
m
o
d
e
F
r
e
q
u
e
n
c
y
/
2
m
o
d
e
S
C
y
s
t
e
m
1
c
l
o
C
c
k
M
4
=
φ
:
0
f
(
X
I
N
)
/
2
M
5
=
CM
7
=“0”
CM
6
=
“
1
”
L
S
o
w
s
-
t
s
e
p
m
e
e
c
d
o
c
m
k
o
φ
d
:
e
y
l
f
(
X
C
I
N
)
/
2
X
I
C
N
M
7
=
s
t
o
0
p
,
,
C
X
C
M
6
=
I
N
o
s
c
i
l
l
a
t
i
o
n
0
L
S
o
w
s
-
t
p
e
o
m
w
c
e
l
r
c
d
k
i
s
φ
s
i
:
p
a
f
(
t
i
o
n
I
m
o
2
d
e
y
o
X
C
N
)
/
CM
7
=
“
1
”
CM
7
=
“
0
”
CM
6
=
“
0
”
S
y
s
t
e
m
c
l
o
c
k
=
M
a
i
n
c
l
o
c
k
f
(
X
I
N
)
R
e
s
e
t
CM
5
CM
4
: Main clock division ratio selection bits
00: X
IN
/8 (frequency/8)
01: X
IN
/4 (frequency/4)
10: X
IN
/2 (frequency/2)
11: X
IN
(through mode)
CM
7
CM
6
: System clock control bits
00: X
IN
stop, X
oscillation, system clock = X
CIN
01: X
IN
oscillation, X
CIN
stop, system clock = X
IN
10: X
IN
oscillation, X
CIN
oscillation, system clock = X
CIN
11: X
IN
oscillation, X
CIN
oscillation, system clock = X
IN
CPU mode register
(CPUM : address 003B
16
)
b7
b4
1:
When the mode is switched from through or frequency/2/4/8 to the low-speed mode,
or the opposite is performed, change CM
7
at first, and then, change CM
6
after the oscillation of
the changed mode is stabilized.
2:
The all modes can be switched to the stop mode or the wait mode and return 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 time can be set by connecting timer 1 and timer 2.
N
o
t
e
s
Frequency/4 mode
y
s
t
e
m
c
l
C
M
5
=
0
F
r
y
C
e
q
u
e
n
c
y
/
8
m
o
d
e
S
o
C
c
k
M
4
=
φ
:
1
f
(
X
I
N
)
/
4
S
s
t
e
m
0
c
l
o
C
c
k
M
4
=
φ
:
0
f
(
X
I
N
)
/
8
M
5
=
CM
7
=
“
1
”
X
IN
oscillation, X
CIN
oscillation
CM
7
=1, CM
6
=1
h
r
o
u
y
s
t
e
m
c
l
o
C
M
5
=
1
T
g
h
m
o
d
e
F
System clock
φ
: f(X
IN
)/2
CM
5
=1
CM
4
=0
r
e
q
u
e
n
c
y
/
2
m
o
d
e
Frequency/4 mode
S
s
t
e
m
c
C
M
5
=
0
F
r
e
q
u
e
n
c
y
/
8
m
o
d
e
S
c
k
M
4
=
φ
:
1
f
(
X
I
N
)
C
y
l
o
C
c
k
M
4
=
φ
:
1
f
(
X
I
N
)
/
4
System clock
φ
: f(X
IN
)/8
CM
5
=0
CM
4
=0
S
=
y
s
t
u
e
b
m
-
l
c
o
l
o
c
c
k
k
f
(
X
C
S
c
I
N
)
X
I
C
N
M
7
=
o
s
c
1
i
l
l
C
a
t
M
6
=
i
o
n
,
1
X
C
I
N
o
s
c
i
l
l
a
t
i
o
n
,
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