Renesas 7700 FAMILY User Manual page 515

APPENDIX
Appendix 8. Examples of noise immunity improvement
2. Connection of bypass capacitor between Vss and Vcc lines
Connect an approximate 0.1 µ F bypass capacitor as follows:
Connect a bypass capacitor between the Vss and Vcc pins, at equal lengths.
The wiring connecting the bypass capacitor between the Vss and Vcc pins should be as short as
possible.
Use thicker wiring for the Vss and Vcc lines than the other signal lines.
Fig. 9. Bypass capacitor between Vss and Vcc lines
20–64
Bypass capacitor
Wiring pattern
Vss
M37751
7751 Group User's Manual
Wiring pattern
Vcc