參數(shù)資料
型號: M38749MFT-XXXGP
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): 57/92頁
文件大小: 1292K
代理商: M38749MFT-XXXGP
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
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 FFFD16 (high-order byte) and address FFFC16 (low-
order byte). Make sure that the reset input voltage is 0.6 V or less
for VCC of 3.0 V.
Fig. 66 Reset sequence
Fig. 65 Reset circuit example
(Note)
0.2VCC
0V
Poweron
VCC
RESET
VCC
RESET
Power source
voltage detection
circuit
Power source
voltage
Reset input
voltage
Note : Reset release voltage ; Vcc=2.5 V
FFFC
FFFD
ADH,ADL
ADL
ADH
RESET
Internal
reset
Address
Data
SYNC
φ
??
XIN
XIN : 40 to 56 clock cycles
Reset address from
the vector table
1: The frequency relation of f(XIN) and f(
φ) is f(XIN)=8 f(φ).
2: The question marks (?) indicate an undefined state that depends on the previous state.
Notes
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