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參數(shù)資料
| 型號(hào)： | AN1775 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國(guó))有限公司 |
| 英文描述： | Expanding Digital Input with an A/D Converter |
| 中文描述： | 擴(kuò)展數(shù)字輸入與A / D轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 283K |
| 代理商： | AN1775 |
Application Note
A Brief Example with the MC68HC705P6A MCU
AN1775 Rev. 1
A Brief Example with the MC68HC705P6A MCU
The small code segment example that follows illustrates the software
implementation of this method of keypress arbitration. The example was
defined around the spreadsheet analysis example shown in
Table 1
.
The MC68HC705P6A (P6A) MCU features a 4-channel, 8-bit A/D
converter. The P6A ADC uses continuous conversion, making a new
value available every 32 internal clock cycles after being turned on.
The software example assumes a resistor ladder is connected to AD0
(A/D channel 0, port C, pin 6). The software is not intended to be a
complete application.
This software starts the ADC, selects channel 0 for A/D conversions,
then polls the ADC data register to determine if a key was pressed. The
software uses a lookup table, with predefined maximum and minimum
ADC values which represent a specific segment in the divider being
grounded.
Once the key has been arbitrated, the RAM variable InKey will tell an
application which key was switched most recently.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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