Table 4-28. gafr2_l bit definitions, Table 4-29. gafr2_u register bitmap – Intel PXA26X User Manual
Page 128
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.