General-Purpose I/O (Gpio); Table 30. Port Bit Configuration Table - STMicroelectronics RM0365 Reference Manual

General-purpose I/Os (GPIO)
MODER(i)
[1:0]
01
10
00
11
1. GP = general-purpose, PP = push-pull, PU = pull-up, PD = pull-down, OD = open-drain, AF = alternate
function.
10.3.1

General-purpose I/O (GPIO)

During and just after reset, the alternate functions are not active and most of the I/O ports
are configured in input floating mode.
The debug pins are in AF pull-up/pull-down after reset:
When the pin is configured as output, the value written to the output data register
(GPIOx_ODR) is output on the I/O pin. It is possible to use the output driver in push-pull
mode or open-drain mode (only the low level is driven, high level is HI-Z).
The input data register (GPIOx_IDR) captures the data present on the I/O pin at every AHB
clock cycle.
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Table 30. Port bit configuration table

OSPEEDR(i)
OTYPER(i)
[1:0]
0
0
0
0
SPEED
[1:0]
1
1
1
1
0
0
0
0
SPEED
[1:0]
1
1
1
1
x x
x x
x x
x x
x x
x x
x x
x x
DocID025202 Rev 7
PUPDR(i)
[1:0]
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
x 0 0
x 0 1
x 1 0
x 1 1
x 0 0
x 0 1
x 1 0
x 1 1
(1)
I/O configuration
GP output PP
GP output PP + PU
GP output PP + PD
Reserved
GP output OD
GP output OD + PU
GP output OD + PD
Reserved (GP output OD)
AF PP
AF PP + PU
AF PP + PD
Reserved
AF OD
AF OD + PU
AF OD + PD
Reserved
Input Floating
Input PU
Input PD
Reserved (input floating)
Input/output Analog
Reserved
RM0365