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M38B71M1 Datasheet(PDF) 70 Page - Renesas Technology Corp

Part No. M38B71M1
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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M38B71M1 Datasheet(HTML) 70 Page - Renesas Technology Corp

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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
69
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 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 (switching to the high-speed mode, a
power source voltage must be between 4.0 V and 5.5 V).
Fig. 77 Reset sequence
Fig. 76 Reset circuit example
(Note)
0.2VCC
0V
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
Internal
reset
Data
φ
Address
SYNC
XIN: about 4000 cycles
XIN
?
?
?
?
?
FFFC
FFFD
ADH, ADL
1: The frequency relation of f(XIN) and f(
φ) is f(XIN)=4 f(φ).
2: The question marks (?) indicate an undefined state that depends on the previous state.
Notes
ADL
ADH


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