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使用微控制器的AD转换器扩展数字输入的方法
消耗积分:3 |
格式:rar |
大小:79 |
2009-06-23
石玉兰
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This application note documents a method of extending digital input
using the analog-to-digital converter (ADC) of a microcontroller unit
(MCU).
Many MCU applications require digital input and arbitration. For
example, determining which key of a keypad was pressed. This is
commonly done by arranging switches in a matrix configuration,
connecting to a series of digital input pins, and reading a digital input
data register to determine which key was pressed. While this method is
easily implemented, it does require the use of an MCU’s parallel port
pins.
using the analog-to-digital converter (ADC) of a microcontroller unit
(MCU).
Many MCU applications require digital input and arbitration. For
example, determining which key of a keypad was pressed. This is
commonly done by arranging switches in a matrix configuration,
connecting to a series of digital input pins, and reading a digital input
data register to determine which key was pressed. While this method is
easily implemented, it does require the use of an MCU’s parallel port
pins.
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