參數(shù)資料
型號: M38198E6-XXXFS
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): 45/60頁
文件大?。?/td> 664K
代理商: M38198E6-XXXFS
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
μ
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 X
IN
oscillation is stable), reset is released. In order to give
the X
IN
clock time to stabilize, internal operation does not begin
until after about 4000 X
IN
clock cycles (256 cycles of f(X
IN
)/16) are
completed. After the reset is completed, the program starts from
the address contained in address FFFD
16
(high-order) and ad-
dress FFFC
16
(low-order). Make sure that the reset input voltage
is 0.5 V or less for 2.8 V of V
CC
.
Fig. VB-2 Example of reset circuit
Fig. VB-2 Reset sequence
Note :
Reset release voltage : V
CC
= 2.8 V
Power source
voltage
Poweron
(Note)
V
CC
RESET
V
CC
RESET
Power source voltage
detection circuit
0 V
Reset input
voltage
0.2V
CC
0 V
about 4000
X
IN
clock cycles
RESET
Internal reset
f(X
IN
) and f(
φ
) are in the relationship : f(X
IN
) = 8
f(
φ
)
A question mark () indicates an undefined state that depends on the previous state.
Notes 1 :
2 :
SYNC
Data
Address
φ
X
IN
Reset address from
vector table
FFFC
FFFD
AD
H
, AD
L
AD
L
AD
H
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