Two Wire Interface (Twi); Sd/Mmc Interface - Atmel AT91SAM9G45-EKES User Manual

Board Description
4.2.11

Two Wire Interface (TWI)

The SAM9G45 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 DataFlash, ISI and TV encoder interface.
Figure 4-15. TWI
4.2.12

SD/MMC Interface

The SAM9G45-EKES 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.
4-18
6481B–ATARM–27-Nov-09
(TW CK0) 6
PA21
SCL
(TW DO) 5
PA20
SDA
8
3V3
VCC
C111 C111
4
100nF 100nF
GND
AT24C512BN-SH25-B AT24C512BN-SH25-B
SERIAL EEPROM
3V3
R54 R54
10K 10K
MN13 MN13
1
A0
2
A1
3
A3
JP13 JP13
7
WP
AT91SAM9G45-EKES User Guide