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7540 Datasheet(PDF) 314 Page - Renesas Technology Corp

Part # 7540
Description  8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 740 SERIES
PDF  366 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7540 Datasheet(HTML) 314 Page - Renesas Technology Corp

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3-92
REJ09B0018-0200Z
Rev.2.00
Jun 21, 2004
APPENDIX
7540 Group
3.4 Countermeasures against noise
Fig. 3.4.2 Wiring for the RESET pin
3.4 Countermeasures against noise
3.4.1 Shortest wiring length
(1) Package
Select the smallest possible package to make the total wiring length short.
q Reason
The wiring length depends on a microcomputer package. Use of a small package, for example
QFP and not DIP, makes the total wiring length short to reduce influence of noise.
Fig. 3.4.1 Selection of packages
(2) Wiring for RESET pin
Make the length of wiring which is connected to the RESET pin as short as possible. Especially,
connect a capacitor across the RESET pin and the VSS pin with the shortest possible wiring (within
20mm).
q Reason
The width of a pulse input into the RESET pin is determined by the timing necessary conditions.
If noise having a shorter pulse width than the standard is input to the RESET pin, the reset is
released before the internal state of the microcomputer is completely initialized. This may cause
a program runaway.
DIP
SDIP
SOP
QFP
RESET
Reset
circuit
Noise
VSS
VSS
Reset
circuit
VSS
RESET
VSS
N.G.
O.K.



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