参数资料
型号: M38749E8D-XXXFS
厂商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 单芯片8位CMOS微机
文件页数: 60/92页
文件大小: 1292K
代理商: M38749E8D-XXXFS
60
3874 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
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 3.0 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 0.6 V or less
for V
CC
of 3.0 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=2.5 V
FFFC
FFFD
AD
H
,AD
L
AD
L
AD
H
RESET
Internal
reset
Address
Data
SYNC
φ
X
IN
X
IN
: 40 to 56 clock cycles
Reset address from
the 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.
Notes
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