Table 4-24. gafr0_l bit definitions, Table 4-25. gafr0_u bit definitions – Intel PXA26X User Manual
Page 126
4-18
Intel® PXA26x Processor Family Developer’s Manual
System Integration Unit
•
“00” indicates normal GPIO function for GPIO[85:0]. Indicates default dedicated functionality
for GPIO[89:86].
•
“01” selects alternate input function 1 (ALT_FN_1_IN) or alternate output function 1
(ALT_FN_1_OUT) for GPIO[85:0]. Selects GPIO function for GPIO[89:86].
•
“10” selects alternate input function 2 (ALT_FN_2_IN) or alternate output function 2
(ALT_FN_2_OUT)
•
“11” selects alternate input function 3 (ALT_FN_3_IN) or alternate output function 3
(ALT_FN_3_OUT)
Warning:
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
GAFR0_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
AF15
AF14
AF13
AF12
AF11
AF10
AF9
AF8
AF7
AF6
AF5
AF4
AF3
AF2
AF1
AF0
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 = 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.
Table 4-25. GAFR0_U Bit Definitions
Physical Address
0x40E0_0058
GAFR0_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
AF31
AF30
AF29
AF28
AF27
AF26
AF25
AF24
AF23
AF22
AF21
AF20
AF19
AF18
AF17
AF16
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 = 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.