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General-purpose and alternate-function I/Os (GPIOs and AFIOs)
Figure 17. Alternate function configuration
RM0008
To on-chip
Alternate Function Input
peripheral
on
Read
TTL Schmitt
trigger
V DD or V DD_FT (1)
Protection
diode
Write
Input driver
I/O pin
Output driver
V DD
Protection
Output
control
P-MOS
diode
VSS
Read/write
N-MOS
From on-chip
peripheral
Alternate Function Output
V SS
push-pull or
open-drain
ai14785
1. V DD_FT is a potential specific to five-volt tolerant I/Os and different from V DD .
8.1.10
Analog input configuration
When the I/O Port is programmed as Analog Input Configuration:
●
●
●
●
The Output Buffer is disabled.
The Schmitt Trigger Input is de-activated providing zero consumption for every analog
value of the I/O pin. The output of the Schmitt Trigger is forced to a constant value (0).
The weak pull-up and pull-down resistors are disabled.
Read access to the Input Data Register gets the value “0”.
The Figure 18 on page 144 shows the High impedance-Analog Input Configuration of the
I/O Port bit.
Figure 18. High impedance-analog input configuration
To on-chip
peripheral
Analog Input
Read
0
off
V DD or V DD_FT (1)
Write
Read/write
From on-chip
Input driver
TTL Schmitt
trigger
V SS
Protection
diode
I/O pin
Protection
diode
144/995
peripheral
Doc ID 13902 Rev 9
ai14786
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