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7733 bảng dữ liệu(PDF) 609 Page - Renesas Technology Corp

tên linh kiện 7733
Giải thích chi tiết về linh kiện  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  940 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

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7733 Group User’s Manual
21-61
APPENDIX
Appendix 8. Countermeasure examples against noise
General countermeasure examples against noise are described below. Although the effect of these
countermeasures depends on each system, refer to the following when a noise-related problem occurs.
1. Shortest wiring length
The wiring on a printed circuit board may function as an antenna which feeds noise into the microcomputer.
The shorter the total wiring length (by mm unit), the less possibility of noise insertion into the microcomputer.
______
(1) Wiring for pin RESET
______
Make the length of wiring connected to pin RESET as short as possible. In particular, connect a
______
capacitor between pin RESET and pin Vss with the shortest possible wiring (within 20 mm).
Reason
______
If noise is input to pin RESET, the microcomputer
restarts operation before the internal state of
the microcomputer is completely initialized. This
may cause a program runaway.
______
Fig. 12 Wiring for pin RESET
RESET
Reset
circuit
Noise
Vss
Vss
Vss
M37733MHBXXXFP
Not acceptable
Reset
circuit
RESET
VSS
M37733MHBXXXFP
Acceptable
Appendix 8. Countermeasure examples against noise



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