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7477 Datasheet(PDF) 274 Page - Renesas Technology Corp

Part # 7477
Description  8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES
PDF  361 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7477 Datasheet(HTML) 274 Page - Renesas Technology Corp

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7470/7471/7477/7478 GROUP USER’S MANUAL
2-48
APPLICATION
2.9 Countermeasures against noise
7470
7471
7477
7478
2.9 Countermeasures against noise
Countermeasures against noise are described below. The following countermeasures are effective against
noise in theory, however, it is necessary not only to take measures as follows but to evaluate before actual
use.
2.9.1 Shortest wiring length
The wiring on a printed circuit board can be as an antenna which feeds noise into the microcomputer.
The shorter the total wiring length (by mm unit), the less the possibility of noise insertion into a microcomputer.
(1) Wiring for the 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).
Reason
The reset works to initialize a microcomputer.
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.
Fig. 2.9.1 Wiring for the RESET pin
Reset
circuit
Reset
circuit
VSS
VSS
VSS
RESET
VSS
RESET
7470/7471/
7477/7478
group
7470/7471/
7477/7478
group
Noise
N.G.
O.K.



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