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7733 bảng dữ liệu(PDF) 611 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
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7733 Group User’s Manual
21-63
APPENDIX
(4) Wiring to pin CNVss
[In single-chip and memory expansion modes]
q Connect pin CNVss to pin Vss of the microcomputer with the shortest possible wiring.
q If the above countermeasure cannot be taken, insert an approximate 5 k
Ω resistor between pins
CNVss and Vss and, again, make the distance between the resistor and pin CNVss as short as
possible.
[In microprocessor mode]
q Connect pin CNVss to pin Vcc with the shortest possible wiring.
Reason
Pin CNVss is connected to the internal ROM in the low-impedance state. (Noise is easily to be fed
to the pin in this condition.)
If noise enters pin CNVss, incorrect instruction codes or data are fetched from the built-in PROM. This
may cause a program runaway.
Fig. 15 Built-in PROM version: Wiring for pin CNVss
Microprocessor mode
CNVSS
VCC
Shortest possible wiring
Approx. 5 K
Ω
Pin CNVss is connected to pin Vss
with the shortest possible wiring.
CNVSS
VSS
Single-chip and
Memory expansion modes
M37733EHBXXXFP
g The above countermeasure is not necessary for pin BYTE.
M37733EHBXXXFP
Pin CNVss is connected to pin Vcc
with the shortest possible wiring.
Shortest possible wiring
Appendix 8. Countermeasure examples against noise



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