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): 129/171頁
文件大?。?/td> 4940K
代理商: S1D13706F00A
7751 Group User’s Manual
20–63
APPENDIX
Appendix 8. Examples of noise immunity improvement
(4)
Wiring for CNVss (VPP) pin of built-in PROM version
< In single-chip or memory expansion modes>
q Connect CNVss (VPP) to Vss pin of the microcomputer with the shortest possible wiring.
q If the above countermeasure can not be taken, insert an approximate 5 k
resistor between
CNVss (VPP) and Vss pins and be sure to make the distance between the resistor and CNVss (VPP)
pin as short as possible.
< In microprocessor mode>
q Connect CNVss (VPP) pin to Vcc pin with the shortest possible wiring.
Reason: CNVss (VPP) pin is connected to the internal ROM in the low-impedance state. (Noise is
easily fed to the pin in this condition.)
If noise enters the CNVss (VPP) pin, incorrect instruction codes or data is fetched from the
built-in PROM. This may cause a program runaway.
Fig. 8. Wiring for CNVss (VPP) pin of built-in PROM version
Microprocessor mode
Shortest possible
distance
CNVSS(VPP)
VCC
M37751
Shortest possible
distance
Approx. 5 kohms
CNVss pin is connected to
Vss pin with the shortest
possible wiring.
CNVSS(VPP)
VSS
Single-chip and
memory expansion modes
M37751
V The above countermeasure is not necessary for BYTE (VPP) pin.
CNVss pin is connected to
Vss pin with the shortest
possible wiring.
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