參數(shù)資料
型號: M38199EF-XXXFP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 4.2 MHz, MICROCONTROLLER, PQFP100
封裝: 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100
文件頁數(shù): 43/63頁
文件大小: 870K
代理商: M38199EF-XXXFP
45
3819 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 2.8 V and 5.5
V, and XIN oscillation is stable), reset is released. In order to give
the XIN clock time to stabilize, internal operation does not begin
until after about 4000 XIN clock cycles (256 cycles of f(XIN)/16) are
completed. After the reset is completed, the program starts from
the address contained in address FFFD16 (high-order) and ad-
dress FFFC16 (low-order). Make sure that the reset input voltage
is 0.5 V or less for 2.8 V of VCC.
Fig. VB-2 Example of reset circuit
Fig. VB-2 Reset sequence
Note : Reset release voltage : VCC = 2.8 V
Power source
voltage
Poweron
(Note)
VCC
RESET
VCC
RESET
Power source voltage
detection circuit
0 V
Reset input
voltage
0.2VCC
0 V
about 4000
XIN clock cycles
RESET
Internal reset
f(XIN) and f(
φ) are in the relationship : f(XIN) = 8f(φ)
A question mark (?) indicates an undefined state that depends on the previous state.
Notes 1 :
2 :
?
??
SYNC
Data
Address
φ
XIN
Reset address from
vector table
?
FFFC
FFFD
ADH, ADL
?
ADL
ADH
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