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STMPE812 Fiches technique(PDF) 19 Page - STMicroelectronics

No de pièce STMPE812
Description  S-Touch® enhanced 4-wire resistive touchscreen controller with PWM
PDF  51 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE812 Fiches technique(HTML) 19 Page - STMicroelectronics

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STMPE812
Interrupt system
Doc ID 17732 Rev 3
19/51
8
Interrupt system
The STMPE812 uses a 2-tier interrupt structure. In normal mode, interrupts from the GPIO
and touchscreen controller assert the INT pin and are available in the Interrupt Status
register (ISR).
In pen down mode, the INT pin is asserted as long as pen down is detected.
Since the INT pin is a OR function of the pen down and all other enabled interrupts, in order
for INT pin to provide the exclusive indication of pen down (INT=Low) and pen up
(INT=High), as such benefit from minimal I2C transactions, it is recommended to use pen
down mode when the GPIO/PWM/ADC functions are not required or the GPIO/PWM/ADC
interrupts are disabled.
Figure 7.
Interrupt system diagram
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