參數(shù)資料
型號: S1D13706F00A
元件分類: 顯示控制器
英文描述: 320 X 240 PIXELS CRT OR FLAT PNL GRPH DSPL CTLR, PQFP100
封裝: TQFP-100
文件頁數(shù): 127/171頁
文件大小: 4940K
代理商: S1D13706F00A
7751 Group User’s Manual
20–61
APPENDIX
Appendix 8. Examples of noise immunity improvement
Generally effective examples of noise immunity improvements are described below. Although the effect of
these countermeasure depends on each system, refer to the following when an noise-related problem
occurs.
1. Short 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 RESET pin
______
Make the length of wiring connected to RESET pin as short as possible.
______
In particular, connect a capacitor between RESET pin and Vss pin with the shortest possible wiring
(within 20 mm).
______
Fig. 5. Wiring for RESET pin
Reason:
______
If noise is input to RESET pin,
the microcomputer restarts operat-
ion before the internal state of the
microcomputer is completely
initialized. This may cause a
program runaway.
RESET
Reset
circuit
Noise
Vss
M37751
Reset
circuit
Vss
RESET
Vss
M37751
Acceptable
Not
acceptable
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