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General-purpose and alternate-function I/Os (GPIOs and AFIOs)
RM0008
8.1.7
Input configuration
When the I/O Port is programmed as Input:
●
●
●
●
●
The Output Buffer is disabled
The Schmitt Trigger Input is activated
The weak pull-up and pull-down resistors are activated or not depending on input
configuration (pull-up, pull-down or floating):
The data present on the I/O pin is sampled into the Input Data Register every APB2
clock cycle
A read access to the Input Data Register obtains the I/O State.
The Figure 15 on page 142 shows the Input Configuration of the I/O Port bit.
Figure 15. Input floating/pull up/pull down configurations
V DD
on/off
on
Read
V D D or V DD_FT(1)
Write
input driver
TTL Schmitt
trigger
on/off
V SS
protection
diode
I/O pin
output driver
protection
diode
Read/write
V SS
ai14783
1. V DD_FT is a potential specific to five-volt tolerant I/Os and different from V DD .
8.1.8
Output configuration
When the I/O Port is programmed as Output:
●
The Output Buffer is enabled:
–
–
Open Drain Mode: A “0” in the Output register activates the N-MOS while a “1” in
the Output register leaves the port in Hi-Z. (the P-MOS is never activated)
Push-Pull Mode: A “0” in the Output register activates the N-MOS while a “1” in the
Output register activates the P-MOS.
●
●
●
●
●
The Schmitt Trigger Input is activated.
The weak pull-up and pull-down resistors are disabled.
The data present on the I/O pin is sampled into the Input Data Register every APB2
clock cycle
A read access to the Input Data Register gets the I/O state in open drain mode
A read access to the Output Data register gets the last written value in Push-Pull mode
The Figure 16 on page 143 shows the Output configuration of the I/O Port bit.
142/995
Doc ID 13902 Rev 9
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