Datasheet

824
32072H–AVR32–10/2012
AT32UC3A3
The MultiMedia Card communication is based on a 13-pin serial bus interface. It has three com-
munication lines and four supply lines.
Notes: 1. I: Input, O: Output, PP: Push/Pull, OD: Open Drain.
Figure 31-4. MMC Bus Connections (One Slot)
Figure 31-5. SD Memory Card Bus Topology
Table 31-2. Bus Topology
Pin
Number Name Type
(1)
Description
MCI Pin Name
(2)
(Slot z)
1 DAT[3] I/O/PP Data DATAz[3]
2 CMD I/O/PP/OD Command/response CMDz
3 VSS1 S Supply voltage ground VSS
4 VDD S Supply voltage VDD
5 CLK I/O Clock CLK
6 VSS2 S Supply voltage ground VSS
7 DAT[0] I/O/PP Data 0 DATAz[0]
8 DAT[1] I/O/PP Data 1 DATAz[1]
9 DAT[2] I/O/PP Data 2 DATAz[2]
10 DAT[4] I/O/PP Data 4 DATAz[4]
11 DAT[5] I/O/PP Data 5 DATAz[5]
12 DAT[6] I/O/PP Data 6 DATAz[6]
13 DAT[7] I/O/PP Data 7 DATAz[7]
CLK
DATA[0]
CMD
MCI
1
2
3
4
5
6
MMC2
7
910
12
13 8
11
1
2
3
4
5
6
MMC3
7
910
12
13 8
11
1
2
3
4
5
6
MMC1
7
910
12
13 8
11
12 43 5678
9
SDCARD