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AN2710 Datasheet(PDF) 21 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) 21 Page - STMicroelectronics

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AN2710
Recommended configuration sequence
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4.2
From alternate function open drain
If the port is set to alternate function open drain, use the following sequences to change
modes.
Table 8.
Alternate push-pull to output push-pull
PC2 - 1
No change
PC1 - 0
Output push-pull
PC0 - 1
No change
Table 9.
Alternate push-pull to alternate function open drain
PC2 - 1
No change
PC1 - 1
No change
PC0 - 0
Alternate function open drain
Table 10.
Alternate function open drain to analog input
PC2 - 0
Reserved/Input
PC1 - 0
Analog input
PC0 - 0
No change
Table 11.
Alternate function open drain to input
PC2 - 0
Reserved/Input
PC1 - 0
Analog input
PC0 - 1
IN
Table 12.
Alternate function open drain to Input pull-up/pull-down
PC2 - 0
Reserved/Input(1)
1.
Reserved for STR73x only
PC1 - 1
No change
PC0 - 1
IPUPD(2)
2.
Input pull-up/pull-down.
Table 13.
Alternate function open drain to output open drain
PC2 - 1
No change
PC1 - 0
Output open drain
PC0 - 0
No change
Table 14.
Alternate function open drain to output push-pull
PC2 - 1
No change
PC1 - 0
Output open drain
PC0 - 1
Output push pull



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