Gafr0_L Bit Definitions; Gafr0_U Bit Definitions - Intel PXA255 Developer's Manual

Caution: Configuring a GPIO to map to an alternate function that is not available causes indeterminate
results.
Table 4-24. GAFR0_L Bit Definitions
Physical Address
0x40E0_0054
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
AF15 AF14 AF13 AF12 AF11 AF10
Reset 0 0 0 0 0 0
Bits Name
<31:0> AF[x]
Table 4-25. GAFR0_U Bit Definitions
Physical Address
0x40E0_0058
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
AF31 AF30 AF29 AF28 AF27 AF26 AF25 AF24 AF23 AF22 AF21 AF20 AF19 AF18 AF17 AF16
Reset 0 0 0 0 0 0
Bits Name
<31:0> AF[x]
Intel® PXA255 Processor Developer's Manual
GAFR0_L
AF9
0 0 0 0 0 0 0 0
GPIO Pin 'x' Alternate Function Select Bits (where x=0 through 15).
A bit-pair in this register determines the corresponding GPIO pin's functionality as one of
the alternate functions that is mapped to it or as a generic GPIO pin.
00 – The corresponding GPIO pin (GPIO[x]) is used as a general purpose I/O.
01 – The corresponding GPIO pin (GPIO[x]) is used for its alternate function 1.
10 – The corresponding GPIO pin (GPIO[x]) is used for its alternate function 2.
11 – The corresponding GPIO pin (GPIO[x]) is used for its alternate function 3.
GAFR0_U
0 0 0 0 0 0 0 0
GPIO Pin 'x' Alternate Function Select Bits (where x=16 through 31).
A bit-pair in this register determines the corresponding GPIO pin's functionality as one of
the alternate functions that is mapped to it or as a generic GPIO pin.
00 – The corresponding GPIO pin (GPIO[x]) is used as a general purpose I/O.
01 – The corresponding GPIO pin (GPIO[x]) is used for its alternate function 1.
10 – The corresponding GPIO pin (GPIO[x]) is used for its alternate function 2.
11 – The corresponding GPIO pin (GPIO[x]) is used for its alternate function 3.
AF8 AF7 AF6 AF5
0 0 0 0 0 0 0 0
Description
0 0 0 0 0 0 0 0
Description
System Integration Unit
System Integration Unit
8 7 6 5 4 3 2
AF4 AF3 AF2 AF1
0 0 0 0 0 0 0 0
System Integration Unit
8 7 6 5 4 3 2
0 0 0 0 0 0 0 0
1 0
AF0
0 0
1 0
0 0
4-17