Gpio Registers; Gpio Port Mode Register (Gpiox_Moder) (X = A..i; Table 31. Rtc_Af2 Pin - ST STM32F40 Series Reference Manual

RM0090
Table 31. RTC_AF2 pin
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..I)

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)
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
Doc ID 018909 Rev 4
Time TAMP1INSEL
stamp TAMPER1
enabled pin selection
0 1
1 1
1 Don't care
0 Don't care
24 23 22 21
MODER11[1:0] MODER10[1:0]
rw rw rw rw
8 7 6 5
MODER3[1:0] MODER2[1:0]
rw rw rw rw
General-purpose I/Os (GPIO)
TSINSEL
ALARMOUTTYPE
TIMESTAMP
RTC_ALARM
pin
configuration
selection
Don't care Don't care
1 Don't care
1 Don't care
Don't care Don't care
Table
20 19 18 17
MODER9[1:0] MODER8[1:0]
rw rw rw rw
4 3 2 1
MODER1[1:0] MODER0[1:0]
rw rw rw rw
32.
16
rw
0
rw
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