Gpio Registers; Gpio Port Mode Register (Gpiox_Moder) (X = A..h; Table 25. Rtc_Af2 Pin - ST STM32F446 Series Reference Manual

RM0390
Pin configuration and function
TAMPER1 input floating
TIMESTAMP and TAMPER1 input
floating
TIMESTAMP input floating
Standard GPIO
7.4

GPIO registers

This section gives a detailed description of the GPIO registers.
For a summary of register bits, register address offsets and reset values, refer to
The GPIO registers can be accessed by byte (8 bits), half-words (16 bits) or words (32 bits).
7.4.1

GPIO port mode register (GPIOx_MODER) (x = A..H)

Address offset: 0x00
Reset values:
•
0xA800 0000 for port A
•
0x0000 0280 for port B
•
0x0000 0000 for other ports
31 30 29 28
MODER15[1:0] MODER14[1:0]
rw rw rw rw
15 14 13 12
MODER7[1:0] MODER6[1:0]
rw rw rw rw
Bits 2y:2y+1 MODERy[1:0]: Port x configuration bits (y = 0..15)

Table 25. RTC_AF2 pin

Tamper
enabled
1
1
0
0
27 26 25
MODER13[1:0] MODER12[1:0]
rw rw rw
11 10 9
MODER5[1:0] MODER4[1:0]
rw rw rw
These bits are written by software to configure the I/O direction mode.
00: Input (reset state)
01: General purpose output mode
10: Alternate function mode
11: Analog mode
Time TAMP1INSEL
stamp TAMPER1
enabled pin selection
0 1
1 1
1 Don't care
0 Don't care
24 23 22
MODER11[1:0] MODER10[1:0]
rw rw rw
8 7 6
MODER3[1:0] MODER2[1:0]
rw rw rw
RM0390 Rev 4
General-purpose I/Os (GPIO)
TSINSEL ALARMOUTTYPE
TIMESTAMP
pin selection
Don't care
1
1
Don't care
21 20 19 18
MODER9[1:0]
rw rw rw rw
5 4 3 2
MODER1[1:0]
rw rw rw rw
RTC_ALARM
configuration
Don't care
Don't care
Don't care
Don't care
Table 26.
17 16
MODER8[1:0]
rw rw
1 0
MODER0[1:0]
rw rw
187/1328
194