參數(shù)資料
型號: M38K27M4L-XXXFP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
封裝: 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù): 145/151頁
文件大小: 1403K
代理商: M38K27M4L-XXXFP
38K2 Group
Rev.3.00
Oct 15, 2006
page 93 of 147
REJ03B0193-0300
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 3.0 V
and 5.25 V for L version, and the oscillation should be stable), re-
set 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 in-
put voltage is under 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
Reset input
voltage
Note : Reset release voltage ;
Vcc = 3.0 V (L version)
Power source
voltage detection
circuit
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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