AT32AP7000_14 Datasheet, PDF (32/63 Pages) ATMEL Corporation – High Performance, Low Power AVR32 32-Bit Microcontroller

AT32AP7000
7.7.6 IO Pins Without Multiplexing
7.7.6.1
Many of the external EBI pins are not controlled by the PIO modules, but directly driven by the
EBI. These pins have programmable pullup resistors. These resistors are controlled by Special
Function Register 4 (SFR4) in the HMATRIX. The pullup on the lines multiplexed with PIO is
controlled by the appropriate PIO control register.
This SFR can also control CompactFlash, SmartMedia or NandFlash Support, see the EBI chap-
ter for details
HMatrix SFR4 EBI Control Register
Name:
HMATRIX_SFR4
Access Type:
Read/Write
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
–
–
–
–
–
–
9
8
–
EBI_DBPUC
7
6
5
4
3
2
1
0
–
–
EBI_CS5A
EBI_CS4A
EBI_CS3A
–
EBI_CS1A
-
• CS1A: Chip Select 1 Assignment
0 = Chip Select 1 is assigned to the Static Memory Controller.
1 = Chip Select 1 is assigned to the SDRAM Controller.
• CS3A: Chip Select 3 Assignment
0 = Chip Select 3 is only assigned to the Static Memory Controller and NCS3 behaves as
defined by the SMC.
1 = Chip Select 3 is assigned to the Static Memory Controller and the NAND Flash/SmartMedia
Logic is activated.
• CS4A: Chip Select 4 Assignment
0 = Chip Select 4 is assigned to the Static Memory Controller and NCS4, NCS5 and NCS6
behave as defined by the SMC.
1 = Chip Select 4 is assigned to the Static Memory Controller and the CompactFlash Logic is
activated.
• CS5A: Chip Select 5 Assignment
0 = Chip Select 5 is assigned to the Static Memory Controller and NCS4, NCS5 and NCS6
behave as defined by the SMC.
1 = Chip Select 5 is assigned to the Static Memory Controller and the CompactFlash Logic is
activated.
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32003MS–AVR32–09/09