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7643 Datasheet(PDF) 309 Page - Renesas Technology Corp

Part # 7643
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  424 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7643 Datasheet(HTML) 309 Page - Renesas Technology Corp

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Rev.2.00
Aug 28, 2006
page 188 of 202
7643 Group
REJ09B0133-0200
APPLICATION
2.9 Reset
2.9.2 Notes on reset
(1) Connecting capacitor
In case where the RESET signal rise time is long, connect a ceramic capacitor or others across
the RESET pin and the VSS pin. Use a 1000 pF or more capacitor for high frequency use. When
connecting the capacitor, note the following :
• Make the length of the wiring which is connected to a capacitor as short as possible.
• Be sure to verify the operation of application products on the user side.
q Reason
If the several nanosecond or several ten nanosecond impulse noise enters the RESET pin, it
may cause a microcomputer failure.
2.9 Reset
2.9.1 Connection example of reset IC
Figure 2.9.1 shows the system example which switches to the RAM backup mode by detecting a drop
of the system power source voltage with the INT interrupt.
Fig. 2.9.1 RAM backup system
VCC
RESET
RESET
INT
Cd
VCC1
VCC2
V1
GND
M62009L, M62009P, M62009FP
INT
VSS
System power
source voltage
+5 V
+
7643 Group



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