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AN2710 Datasheet(PDF) 10 Page - STMicroelectronics

Part # AN2710
Description  Safe GPIO port configuration in STR7xx devices
PDF  30 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2710 Datasheet(HTML) 10 Page - STMicroelectronics

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STR71x & STR73x I/O ports
AN2710
10/30
Figure 4.
Output configuration
1.2.5
Alternate function configuration
When the I/O port is programmed as alternate function:
●
The output buffer is turned on in open drain or push-pull configuration
●
The output buffer is driven by the signal coming from the peripheral (alternate function
out)
●
The data present on the I/O pin are sampled into the input latch with every clock cycle
●
A read access to the Data register gets the value in the Input Latch.
Figure 5 shows the Alternate function configuration of the I/O port bit.
Figure 5.
Alternate function configuration
I/O pin
Analog input
Alternate function (OUT)
Alternate function (IN)
Open drain
Push-pull
ai14918
I/O pin
Analog input
Alternate function (OUT)
Alternate function (IN)
Open drain
Push-pull
ai14919



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