參數(shù)資料
型號： PPXY8300A6T1
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： Pressure Sensor
英文描述： DIFFERENTIAL, PEIZORESISTIVE PRESSURE SENSOR, RECTANGULAR, SURFACE MOUNT
封裝： SOIC-20
文件頁數(shù)： 109/162頁
文件大?。?/td> 4316K
代理商： PPXY8300A6T1
MPXY8300 Series
Sensors
50
Freescale Semiconductor
7.4.2
Edge and Level Sensitivity
A valid edge or level on an enabled KBI pin will set KBF in KBISC. If KBIE in KBISC is set, an interrupt request will be presented
to the CPU. Clearing of KBF is accomplished by writing a 1 to KBACK in KBISC provided all enabled keyboard inputs are at their
reset levels. KBF will remain set if any enabled KBI pin is asserted while attempting to clear by writing a 1 to KBACK.
7.4.3
KBI Pull-up/Pull-down Resistors
The KBI pins can be configured to use an internal pull-up/pull-down resistor using the associated I/O port pull-up enable register.
If an internal resistor is enabled, the KBIES register is used to select whether the resistor is a pull-up (KBEDGn = 0) or a pull-
down (KBEDGn = 1).
7.4.4
KBI Initialization
When a keyboard interrupt pin is first enabled it is possible to get a false keyboard interrupt flag. To prevent a false interrupt
request during keyboard initialization, the user should do the following:
1.
Mask keyboard interrupts by clearing KBIE in KBISC.
2.
Enable the KBI polarity by setting the appropriate KBEDGn bits in KBIES.
3.
If using internal pull-up/pull-down device, configure the associated pull-up enable bits in PTxPE.
4.
Enable the KBI pins by setting the appropriate KBIPEn bits in KBIPE.
5.
Write to KBACK in KBISC to clear any false interrupts.
6.
Set KBIE in KBISC to enable interrupts.
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