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STMPE2403 Datasheet(PDF) 35 Page - STMicroelectronics

Part # STMPE2403
Description  24-bit Enhanced port expander with Keypad and PWM controller Xpander logic
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE2403 Datasheet(HTML) 35 Page - STMicroelectronics

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STMPE2403
GPIO controller
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10.2
GPIO Alternate Function Register (GPAFR)
GPAFR is to select the functionality of the GPIO pin. To select a function for a GPIO pin, a
bit-pair in the register (GPAFR_U or GPAFR_L) has to be set.
GPAFR_U_msb
Bit
23
22212019181716
AF23
AF22
AF21
AF20
R/W
RWRWRWRW
RW
RW
RW
RW
Reset
Value
0000000
0
GPAFR_U_csb
Bit
15
1413121110
9
8
AF19
AF18
AF17
AF16
R/W
RWRWRWRW
RW
RW
RW
RW
Reset
Value
0000000
0
GPAFR_U_lsb
Bit
7654321
0
AF15
AF14
AF13
AF12
R/W
RWRWRWRW
RW
RW
RW
RW
Reset
Value
0000000
0
Table 34. Bit description
Bits
Name
Description
23:0
AF[x]
GPIO Pin ‘x’ Alternate Function Select (where x = 23 to 12).
‘00’ – The corresponding GPIO pin (GPIO[x]) is configured to Primary Function.
‘01’ – The corresponding GPIO pin (GPIO[x]) is configured to Alternate Function 1.
‘10’ – The corresponding GPIO pin (GPIO[x]) is configured to Alternate Function 2.
‘11’ – The corresponding GPIO pin (GPIO[x]) is configured to Alternate Function 3.


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