参数资料
型号: M38227ECHP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP80
封装: 12 X 12 MM, 0.50 MM PITCH, PLASTIC, QFP-80
文件页数: 39/82页
文件大小: 1168K
代理商: M38227ECHP
41
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
3822 Group
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 VCC(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 FFFD16 (high-order byte) and ad-
dress FFFC16 (low-order byte). Make sure that the reset input
voltage meets VIL spec. when a power source voltage passes
VCC(min.).
Fig. 39 Reset Circuit Example
Fig. 40 Reset Sequence
Power on
Power
source
voltage
Reset input
voltage
Power source voltage
detection circuit
VIL spec.
0V
VCC
RESET
VCC
RESET
Internal
reset
Address
Data
SYNC
φ
XIN
XIN : about 8000 cycles
Reset address from
vector table
Notes 1: The frequency relation of f(XIN) and f(
φ) is f(XIN) =8f(φ)
2: The question marks (?) indicate an undefined state that depends on the previous state.
FFFC
FFFD
ADH, ADL
ADL
ADH
????
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