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4-20 Intel® PXA26x Processor Family Developer’s Manual
System Integration Unit
Table 4-28. GAFR2_L Bit Definitions
Physical Address
0x40E0_0064
GAFR2_L System Integration Unit
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
AF79 AF78 AF77 AF76 AF75 AF74 AF73 AF72 AF71 AF70 AF69 AF68 AF67 AF66 AF65 AF64
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bits Name Description
<31:0> AF[x]
GPIO PIN ‘X’ ALTERNATE FUNCTION SELECT BITS (where x = 64 through 79):
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.
Table 4-29. GAFR2_U Register Bitmap
Physical Address
0x40E0_0068
GPIO Alternate Function Register2
Upper(GAFR2_U)
System Integration Unit
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved AF89 AF88 AF87 AF86 AF85 AF84 AF83 AF82 AF81 AF80
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bits Name Description
<31:2> — Reserved
<19:12> AF[x]
GPIO PIN ‘X’ ALTERNATE FUNCTION SELECT BITS (where x = 86 through 89):
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 for its alternate function 0.
01 – The corresponding GPIO pin (GPIO[x]) is used as a general purpose I/O.
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.
<11:0> AF[x]
GPIO PIN ‘X’ ALTERNATE FUNCTION SELECT BITS (where x = 80 through 85):
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.