參數(shù)資料
型號: 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
文件頁數(shù): 46/63頁
文件大小: 1000K
代理商: 38C2
46
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.
RESET CIRCUIT
To reset the microcomputer, RESET pin should be held at an
L
level for 2
μ
s or more. Then the RESET pin is returned to an
H
level
(the power source voltage should be between V
CC
(min.) and 5.5 V,
and the quartz-crystal oscillator 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 meets V
IL
spec. when a power source voltage passes V
CC
(min.).
Fig. 48 Reset sequence
Fig. 47 Reset circuit example
V
IL
spec.
0V
0V
Poweron
V
CC
RESET
V
CC
RESET
Power source
voltage detection
circuit
Power source
voltage
Reset input
voltage
RESET
Internal
reset
Address
Data
SYNC
φ
X
IN
FFFC
FFFD
AD
H,
AD
L
AD
L
X
IN
: about 8000 cycles
Note
Reset address from
vector table
1:
The frequency relation of f(X
IN
) and f(
φ
) is f(X
IN
) = 8
f(
φ
).
2:
The question marks () indicate an undefined state that depends on the previous state.
AD
H
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