General-purpose and alternate-function I/Os (GPIOs and AFIOs)
RM0008
8.2
8.2.1
GPIO registers
Refer to Section 1.1 on page 37 for a list of abbreviations used in register descriptions.
Port configuration register low (GPIOx_CRL) (x=A..G)
Address offset: 0x00
Reset value: 0x4444 4444
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
CNF7[1:0]
MODE7[1:0]
CNF6[1:0]
MODE6[1:0]
CNF5[1:0]
MODE5[1:0]
CNF4[1:0]
MODE4[1:0]
rw
15
rw
14
rw
13
rw
12
rw
11
rw
10
rw
9
rw
8
rw
7
rw
6
rw
5
rw
4
rw
3
rw
2
rw
1
rw
0
CNF3[1:0]
MODE3[1:0]
CNF2[1:0]
MODE2[1:0]
CNF1[1:0]
MODE1[1:0]
CNF0[1:0]
MODE0[1:0]
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
Bits 31:30, 27:26, CNFy[1:0]: Port x configuration bits (y= 0 .. 7)
23:22, 19:18, 15:14,
11:10, 7:6, 3:2
These bits are written by software to configure the corresponding I/O port.
In input mode (MODE[1:0]=00) :
00: Analog input mode
01: Floating input (reset state)
10: Input with pull-up / pull-down
11: Reserved
In output mode (MODE[1:0] > ? 00) :
00: General purpose output push-pull
01: General purpose output Open-drain
10: Alternate function output Push-pull
11: Alternate function output Open-drain
Bits 29:28, 25:24, MODEy[1:0]: Port x mode bits (y= 0 .. 7)
21:20, 17:16, 13:12,
9:8, 5:4, 1:0
148/995
These bits are written by software to configure the corresponding I/O port.
00: Input mode (reset state)
01: Output mode, max speed 10 MHz.
10: Output mode, max speed 2 MHz.
11: Output mode, max speed 50 MHz.
Doc ID 13902 Rev 9
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