參數資料
型號: M38K29F8LHP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封裝: 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64
文件頁數: 17/126頁
文件大?。?/td> 2167K
代理商: M38K29F8LHP
HARDWARE
1-94
38K2 Group User’s Manual
FUNCTIONAL DESCRIPTION
Fig. 137 Example of reset circuit
RESET CIRCUIT
To reset the microcomputer, RESET pin should be held at an “L”
level for 16 cycles or more of XIN. Then the RESET pin is returned
to an “H” level (the power source voltage should be between 4.0 V
and 5.25 V for Standard or between 3.0 V and 5.25 V for L ver-
sion, and the oscillation should be stable), reset is released. After
the reset is completed, the program starts from the address con-
tained in address FFFD16 (high-order byte) and address FFFC16
(low-order byte). Make sure that the reset input voltage is 0.8 V for
VCC of 4.0 V (Standard), it is 0.6 V for VCC of 3.0 V (L version).
Fig. 138 Reset sequence
0 V
VCC
RESET
VCC
RESET
(Note)
0.2VCC
Poweron
Power source
voltage detection
circuit
Power
source
voltage
Reset input
voltage
Note : Reset release voltage ;
Vcc = 4.0 V (Standard)
Vcc = 3.0 V (L version)
RESET
Internal
reset
Data
φ
Address
SYNC
XIN: 10.5 to 18.5 clock cycles
XIN
?
FFFC
FFFD
ADH,L
?
ADL
ADH
1: The frequency relation of f(XIN) and f(
φ) is f(XIN)=8 f(φ).
2: The question marks (?) indicate an undefined state that depends on the previous state.
Reset address from the vector table.
Notes
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