Filter
Top Products
4-18 Intel® PXA255 Processor Developer’s Manual
System Integration Unit
Table 4-26. GAFR1_L Bit Definitions
Physical Address
0x40E0_005C
GAFR1_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
AF47 AF46 AF45 AF44 AF43 AF42 AF41 AF40 AF39 AF38 AF37 AF36 AF35 AF34 AF33 AF32
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=32 through 47).
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 4-27. GAFR1_U Bit Definitions
Physical Address
0x40E0_0060
GAFR1_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
AF63 AF62 AF61 AF60 AF59 AF58 AF57 AF56 AF55 FA54 AF53 AF52 AF51 AF50 AF49 AF48
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=48 through 63).
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.