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AN2710 Datasheet(PDF) 22 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) 22 Page - STMicroelectronics

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Recommended configuration sequence
AN2710
22/30
4.3
From output push-pull
if the port is set to output push-pull, use the following sequences to change modes.
Table 15.
Alternate function open drain to alternate function push-pull
PC2 - 1
No change
PC1 - 1
No change
PC0 - 1
Alternate function push-pull
Table 16.
Output push-pull to analog Input
PC2 - 0
Input
PC1 - 0
No change
PC0 - 0
Analog input
Table 17.
Output push-pull to input
PC2 - 0
Input
PC1 - 0
No change
PC0 - 1
No change
Table 18.
Output push pull to Input pull-up/pull-down
PC2 - 0
Input
PC1 - 1
IPUPD(1)
1.
Input pull-up/pull-down.
PC0 - 1
No change
Table 19.
Output push-pull to output open drain
PC2 - 1
No change
PC1 - 0
No change
PC0 - 0
Output open drain
Table 20.
Output push-pull to alternate function open drain
PC2 - 1
No change
PC1 - 1
Alternate function push-pull
PC0 - 0
Alternate function open drain
Table 21.
Output push-pull to alternate function push-pull
PC2 - 1
No change
PC1 - 1
Alternate function push-pull
PC0 - 1
No change



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