Interrupt-driven keyboard for MCS-51 uses few components
Designers of microcontroller-based products that require a keypad for user data entry can select from dedicating an input line for each key, continuously polling the keypad's x and y lines, or generating an interrupt whenever a user presses a key. The third method, an interrupt-driven keypad, o...
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| Veröffentlicht in: | EDN 2005-05, Vol.50 (11), p.97-98 |
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| creator | Satav, Sandeep M |
| description | Designers of microcontroller-based products that require a keypad for user data entry can select from dedicating an input line for each key, continuously polling the keypad's x and y lines, or generating an interrupt whenever a user presses a key. The third method, an interrupt-driven keypad, offers several benefits. First, using interrupts frees the microcontroller to perform other tasks or to switch into an idling or power-down mode while awaiting the next key closure. Second, using interrupts helps reduce electromagnetic interference produced by continuously scanning the keypad's lines. The microcontroller's software returns a binary-formatted input corresponding to the pressed key's number. However, recovery from power-down mode to active mode to active mode normally requires a hardware reset. |
| format | Magazinearticle |
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| ispartof | EDN, 2005-05, Vol.50 (11), p.97-98 |
| issn | 0012-7515 2163-4084 |
| language | eng |
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| source | Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| subjects | Central processing units Controllers Design Design and construction Design engineering Diodes Keyboards Keyboards (Electronics) Microcontrollers Microprocessors |
| title | Interrupt-driven keyboard for MCS-51 uses few components |
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