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| 型号： | DM240011 |
| 厂商： | Microchip Technology |
| 文件页数： | 14/42页 |
| 文件大小： | 0K |
| 描述： | KIT STARTER MPLAB FOR PIC24F MCU |
| 标准包装： | 1 |
| 系列： | MPLAB® |
| 类型： | MCU |
| 适用于相关产品： | PIC24F |
| 所含物品： | 板，线缆，CD |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
| 相关产品： | PIC24FJ64GB106-I/MR-ND - IC PIC MCU FLASH 64K 64-QFN PIC24FJ128GB106-I/MR-ND - IC PIC MCU FLASH 128K 64-QFN PIC24FJ192GA106-E/PT-ND - IC PIC MCU FLASH 192KB 64-TQFP PIC24FJ256GA106-E/PT-ND - IC PIC MCU FLASH 256KB 64-TQFP PIC24FJ192GA108-E/PT-ND - IC PIC MCU FLASH 192KB 80-TQFP PIC24FJ256GA110-E/PT-ND - IC PIC MCU FLASH 256KB 100-TQFP PIC24FJ192GA110-E/PT-ND - IC PIC MCU FLASH 192KB 100-TQFP PIC24FJ128GA108-E/PT-ND - IC PIC MCU FLASH 128KB 80-TQFP PIC24FJ256GA108-E/PT-ND - IC PIC MCU FLASH 256KB 80-TQFP PIC24FJ128GA110-E/PT-ND - IC PIC MCU FLASH 128KB 100-TQFP 更多... |
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MPLAB Starter Kit for PIC24F User’s Guide
2.1.2
Touch Interface (CMTU)
To control most of the demo application’s features, the PIC24F microcontroller uses an
on-chip Charge Time Measurement Unit (CTMU) module to implement a capacitive
touch-sensitive touch pad on the starter kit board. The CTMU allows the microcontroller
to directly sense the touch of a fingertip on the touch pad and interpret this as a control
input.
The touch pad (Figure 2-2) is used to select all menu options and input user choices
for all options. At each of the menu screens, the up/down arrows (1 and 3) and left/right
arrows (2 and 4) serve to highlight a menu option displayed on the OLED, and the cen-
ter key (5) is used to select the option.
FIGURE 2-2:
CAPACITIVE TOUCH PAD
UP
1
LEFT
4
5
CENTER
2
RIGHT
3
DOWN
2.1.2.1
TOUCH PAD CALIBRATION
By default, the application is preprogrammed with a CTMU calibration that responds
appropriately to the touch of an average person’s finger tip. However, there are many
factors (ambient temperature and humidity, skin moisture, etc.) that may affect the
touch pad’s performance. To accommodate these differences, the demo application
includes a calibration routine to adjust the touch pad’s response.
To run the calibration, select “Utilities” from the main menu, then “Calibrate” from the
“Utilities” menu. A series of prompts appears, asking the user to touch and release
each individual pad in turn. When the sequence is completed, the “Calibration com-
plete!” message appears. The application automatically returns to the main menu
afterwards.
Calibration is reset to the default application value on power-up.
DS51725A-page 10
Note:
It is important to respond to each prompt as quickly as possible, to maintain
contact with a pad until instructed to release it, and to be certain that none
of the pads are being touched during the “release” intervals. Otherwise, one
or more of the individual pads may be incorrectly calibrated, and the
application may act erratically or start responding to “phantom” inputs.
? 2008 Microchip Technology Inc.
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