參數(shù)資料
型號： 3820
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
文件頁數(shù)： 43/66頁
文件大?。?/td> 1093K
代理商： 3820
43
MITSUBISHI MICROCOMPUTERS
3820 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Fig. 38 State transitions of internal clock
φ
CM
4
: Port Xc switch bit
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)
Notes
Reset
C
4
C
7
C
4
C
5
CM
6
"1"
CM
6
"1"
CPU mode register
(CPUM : address 003B
16
)
7
4
C
7
C
5
CM
6
"1"
CM
6
"1"
"0"
"
"
"
"
"
"
"
"
"
"
"
"
"0"
"0"
"0"
CM
4
CM
6
"1
"0
"0
"1
CM
4
"1
CM
6
"1
"0
"0
CM
5
CM
6
"1
"0
"0
"1
CM
5
"1
CM
6
"1
"0
"0
CM
7
=0(8MHz selected)
CM
6
=1(Middle-speed)
CM
5
=0(8MHz oscillating)
CM
4
=0(32kHz stopped)
CM
7
=0(8MHz selected)
CM
6
=0(High-speed)
CM
5
=0(8MHz oscillating)
CM
4
=0(32kHz stopped)
CM
7
=0(8MHz selected)
CM
6
=0(High-speed)
CM
5
=0(8MHz oscillating)
CM
4
=1(32kHz oscillating)
CM
7
=1(32kHz selected)
CM
6
=0(High-speed)
CM
5
=0(8MHz oscillating)
CM
4
=1(32kHz oscillating)
CM
7
=1(32kHz selected)
CM
6
=0(High-speed)
CM
5
=1(8MHz stopped)
CM
4
=1(32kHz oscillating)
CM
7
=0(8MHz selected)
CM
6
=1(Middle-speed)
CM
5
=0(8MHz oscillating)
CM
4
=1(32kHz oscillating)
CM
7
=1(32kHz selected)
CM
6
=1(Middle-speed)
CM
5
=0(8MHz oscillating)
CM
4
=1(32kHz oscillating)
CM
7
=1(32kHz selected)
CM
6
=1(Middle-speed)
CM
5
=1(8MHz stopped)
CM
4
=1(32kHz oscillating)
Low-speed mode (f(
φ
) =16 kHz)
Low-speed mode (f(
φ
) =16 kHz)
Low-speed mode (f(
φ
) =16 kHz)
Low-speed mode (f(
φ
) =16 kHz)
High-speed mode (f(
φ
) =4MHz)
Middle-speed mode
(f(
φ
) =1 MHz)
Middle-speed mode
(f(
φ
) =1 MHz)
High-speed mode (f(
φ
) =4MHz)
t
2.
X
IN
before the switching from the low-speed mode to middle-/high-
1: Switch the mode by the allows shown between the mode blocks. (Do not switch between the mode directly without an allow.)
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 wai
mode is released.
3: Timer and LCD operate in the wait mode.
4: In middle-/high-speed mode, when the stop mode is released, a delay of approximately 1 ms occurs automatically by timer 1 and
timer 2.
5: In low-speed mode, when the stop mode is released, a delay of approximately 0.25 s occurs automatically by timer 1 and timer
6: Wait until oscillation stabilizes after oscillating the main clock
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.
φ
indicates the internal clock.
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