Figure 12. Basic Structure Of A Standard I/O Port Bit; Figure 13. Basic Structure Of A Five-Volt Tolerant I/O Port Bit - STMicroelectronics STM32F05 series Reference Manual

RM0091
Figure 12
bit, respectively.

Figure 12. Basic structure of a standard I/O port bit

To on-chip
peripheral
Read
Write
Read/write
From on-chip
peripheral

Figure 13. Basic structure of a five-volt tolerant I/O port bit

To on-chip
peripheral
Read
Write
Read/write
From on-chip
peripheral
1. V
DD_FT
and Figure 13 show the basic structures of a standard and a 5 V tolerant I/O port
Table 21 gives the possible port bit configurations.
Analog
Alternate function input
Alternate function output
Analog
Alternate function input
Alternate function output
is a potential specific to five-volt tolerant I/Os and different from V
Doc ID 018940 Rev 1
on/off
trigger
Input driver
Output driver
Output
control
on/off
TTL Schmitt
trigger
Input driver
Output driver
Output
control
V
General-purpose I/Os (GPIO)
V
on/off
V
DD on/off
P-MOS
V
N-MOS
V
SS
Push-pull,
open-drain or
disabled
Analog
V
DD
on/off
V
DD on/off
down
P-MOS
V
SS
N-MOS
SS
Push-pull,
open-drain or
disabled
Analog
.
DD
V
DD
DD
Protection
diode
Pull
up
I/O pin
Protection
Pull
down
diode
SS
V
SS
ai15938
(1)
V
DD_FT
Protection
diode
Pull
up
I/O pin
Protection
Pull
diode
V
SS
ai15939b
119/742