Physics · Microcontroller Interfacing
When an external push button switch is connected to a Port 0 pin of an 80C51 microcontroller as an input, the pin requires an external:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Pull-down resistor
- 2Pull-up resistor✓
- 3Tristate buffer
- 4Capacitor to ground
Correct answer
Pull-up resistor
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