Board Description
AT91SAM9M10-G45-EK User Guide
4-19
6495B–ATARM–21-Apr-10
4.2.10
Serial Peripheral Interface Controller (SPI)
The SAM9M10 provides two high-speed Serial Peripheral Interface (SPI) controllers. One port is used to
interface with the on-board serial DataFlash
®
.
Figure 4-15.
SPI
4.2.11
Two Wire Interface (TWI)
The SAM9M10 has a full speed (400 kHz) master/slave I2C Serial Controller. The controller is fully com-
patible with the industry standard I2C and SMBus Interfaces. This port is used to interface with the on-
board Serial EEPROM, ISI and TV encoder interface.
Figure 4-16.
TWI
4.2.12
SD/MMC Interface
The SAM9M10-G45-EK has two high-speed 8-bit multimedia interfaces MMC/MMCPlus v4.1. The first
interface is used as an 8-bit interface (MCI1), connected to a CE-ATA connector footprint and an 8-bit
SD/MMC card slot. The second interface is used as a 4-bit interface (MCI0), connected to a 4-bit
SD/MMC card slot.
The users must provide their own compatible cards for use with these connectors.
Please note that the power is connected to VCC, which is 3.3 volts.
3
V
3
3
V
3
PB1
PB2
PB
3
PB0
NR
S
T
S
ERIAL DATAFLA
S
H
(test points)
(
S
PI0_MI
S
O)
(
S
PI0_MO
S
I)
(
S
PI0_
S
PCK)
(
S
PI0_NPC
S
0)
JP12
S
IP2
JP12
S
IP2
1
2
C124
100n
C124
100n
JP11
DNP
JP11
DNP
1
2
3
R67
470k
R67
470k
MN1
3
MN1
3
RE
S
ET
3
GND
7
VCC
6
C
S
4
S
CK
2
S
I
1
S
O
8
WP
5
R6
8
0R
DNP
R6
8
0R
DNP
3
V
3
3
V
3
PA21
PA20
S
ERIAL EEPROM
(TW CK0)
(TW DO)
JP1
3
S
IP2
JP1
3
S
IP2
1
2
R66
10k
R66
10k
C125
100n
C125
100n
MN12
MN12
A0
1
A1
2
WP
7
S
CL
6
VCC
8
A
3
3
S
DA
5
GND
4
