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參數(shù)資料
| 型號： | M38B57 |
| 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)： | 55/69頁 |
| 文件大?。?/td> | 1011K |
| 代理商： | M38B57 |
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MITSUBISHI MICROCOMPUTERS
38B5 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
55
PRELIMINARY
Notice: This s not a final specification.
Some parametric imits are subject to change.
RESET
Internal
reset
Data
φ
Address
SYNC
X
IN
: about 4000 cycles
X
IN
FFFC
FFFD
AD
H
, AD
L
1: The frequency relation of f(X
IN
) and f(
φ
) is f(X
IN
)=4
f(
φ
).
2: The question marks () indicate an undefined state that depends on the previous state.
Notes
AD
L
AD
H
Reset Circuit
To reset the microcomputer, RESET pin should be held at an “L”
level for 2 μs or more. Then the RESET pin is returned to an “H” level
(the power source voltage should be between 2.7 V and 5.5 V, and
the oscillation should be stable), reset is released. After the reset is
completed, the program starts from the address contained in address
FFFD
16
(high-order byte) and address FFFC
16
(low-order byte). Make
sure that the reset input voltage is less than 0.5 V for V
CC
of 2.7 V
(switching to the high-speed mode, a power source voltage must be
between 4.0 V and 5.5 V).
Fig. 66 Reset Sequence
Fig. 65 Reset Circuit Example
(Note)
0.2V
CC
0V
0V
Poweron
V
CC
RESET
V
CC
RESET
Power source
voltage detection
circuit
Power source
voltage
Reset input
voltage
Note
: Reset release voltage ; Vcc=2.7 V
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