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AD7877 Datasheet(PDF) 32 Page - Analog Devices

Part # AD7877
Description  Touch Screen Controller
PDF  46 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7877 Datasheet(HTML) 32 Page - Analog Devices

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Data Sheet
AD7877
If the ALERT source is a GPIO, then masking out the interrupt
by clearing the corresponding ALEN bit to 0 or removing the
source of the interrupt on the GPIO pin causes ALERT to go
high again.
If the ALERT source is an out-of-limit measurement, writing a
0 to the corresponding status bit in the alert status/enable
register causes ALERT to go high. However, the status bit is set
to 1 again on the next measurement cycle, if the measurement
remains out of limit. The ALERT source can also be masked by
clearing the relevant bit in the alert status/enable register to 0.
Table 12. GPIO Configuration
EN
DIR
POL
ALEN
Data Bit
Pin Voltage
ALERT
0
X
X
X
X
X
X
1
0
0
0
0
11
1
1
0
0
0
1
01
1
1
0
0
1
0
11
1
1
0
0
1
1
01
1
1
0
1
0
0
01
1
1
0
1
0
1
11
1
1
0
1
1
0
01
1
1
0
1
1
1
11
1
1
1
0
0
12
0
1
1
1
0
0
02
1
1
1
1
0
1
12
0
0
1
1
0
1
02
1
1
1
1
1
0
02
0
1
1
1
1
0
12
1
1
1
1
1
1
02
0
1
1
1
1
1
12
1
0
1
A change in the data register causes a change in the output voltage on the pin.
2
A change in input voltage on the pin causes a change in the data register bit.
Rev. E | Page 31 of 45



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