參數(shù)資料
型號: M38504M6-XXXSP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42
封裝: 0.600 INCH, 1.78 MM PITCH, PLASTIC, SDIP-42
文件頁數(shù): 21/55頁
文件大小: 867K
代理商: M38504M6-XXXSP
25
3850 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
RESET CIRCUIT
To reset the microcomputer, RESET pin must 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 must be between 2.7 V and 5.5 V,
and the oscillation must be stable), reset is released. After the re-
set 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 less than 0.54 V for
VCC of 2.7 V.
Fig. 30 Reset sequence
Fig. 29 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=2.7 V
RESET
Data
φ
Address
SYNC
XIN: 8 to 13 clock cycles
XIN
?
FFFC
FFFD
ADH,L
?
ADL
ADH
1: The frequency relation of f(XIN) and f(
φ) is f(XIN) = 2 f(φ).
2: The question marks (?) indicate an undefined state that depends on the previous state.
3: All signals except XIN and RESET are internals.
Reset address from the vector table.
Notes
RESETOUT
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