M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 481

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Appendix 5. Countermeasures against noise
The following describes some examples of countermeasures against noise.
Although the effect depends on the system, refer to the following if the problem being relevant to noise
occurs.
total length of wiring (in mm), the smaller the possibility of pulling in noise into the microcomputer.
1. Reduction in wiring length
Wiring on a circuit board can serve as an antenna that pulls in noise into the microcomputer. Shorter the
(1)
Wiring of
Reduce the length of wiring connected to the RESET pin.
Especially, a capacitor that is inserted between the RESET and Vss pins must be connected to these
pins in the shortest possible distance (within 20 mm).
Reasons:
If noise gets into the RESET pin,
the microcomputer will restart op-
erating before its internal state is
completely initialized, which can
cause a program runaway.
RESET
______
pin
______
7702/7703 Group User’s Manual
Appendix 5. Countermeasures against noise
Fig. 10 Wiring of
______
______
Reset
circuit
Vss
______
RESET
N.G.
Reset
circuit
O.K.
Vss
Noise
pin
APPENDIX
Vss
Vss
RESET
RESET
M37702
M37702
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