參數(shù)資料
型號: M37544
廠商: Renesas Technology Corp.
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): 33/68頁
文件大?。?/td> 579K
代理商: M37544
7544 Group
Rev.1.04 2004.06.08 page 33 of 66
REJ03B0012-0104Z
Reset Circuit
The microcomputer is put into a reset status by holding the RE-
SET pin at the “L” level for 2
μ
s or more when the power source
voltage is 4.5 to 5.5 V and X
IN
is in stable oscillation.
After that, this reset status is released by returning the RESET pin
to the “H” level. The program starts from the address having the
contents of address FFFD
16
as high-order address and the con-
tents of address FFFC
16
as low-order address.
In the case of f(
φ
)
8 MHz, the reset input voltage must be 0.9 V
or less when the power source voltage passes 4.5 V.
______
Fig. 37 Example of reset circuit
Fig. 38 Timing diagram at reset
(Note)
0.2 V
CC
0 V
0 V
Poweron
V
CC
RESET
V
CC
RESET
Power source
voltage
detection circuit
Power source
voltage
Reset input
voltage
Note :
Reset release voltage Vcc 4.5V
Data
Address
8-13 clock cycles
Reset address from the
vector table
1 :
An on-chip oscillator applies about RING2 MHz,
φ
250 kHz frequency clock
at average of Vcc = 5 V.
2 :
The mark “” means that the address is changeable depending on the previous state.
3 :
These are all internal signals except RESET.
Notes
FFFC
FFFD
AD
H
,AD
L
AD
L
AD
H
Clock from
on-chip oscillator
RING
φ
RESET
RESET
OUT
SYNC
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