Atmel Xplained Pro Evaluation Kit ATSAMD20-XPRO ATSAMD20-XPRO Data Sheet

387

Atmel | SMART SAM D20 [DATASHEET]

Atmel-42129K–SAM-D20_datasheet–06/2014

The inter-integrated circuit (I

2

C) interface is one of the available modes in the serial communication interface (SERCOM). 

The I

2

C interface uses the SERCOM transmitter and receiver configured as shown in 

. Fields shown in capital 

letters are registers accessible by the CPU, while lowercase fields are internal to the SERCOM. Each side, master and 
slave, depicts a separate I

2

C interface containing a shift register, a transmit buffer and a receive buffer. In addition, the 

I

2

C master uses the SERCOM baud-rate generator, while the I

2

C slave uses the SERCOM address match logic.

z

Master or slave operation 

z

Philips I

2

C compatible 

z

SMBus

™

 compatible 

z

100kHz and 400kHz support at low system clock frequencies

z

Physical interface includes: 

z

Slew-rate limited outputs 

z

Filtered inputs 

z

Slave operation:

z

Operation in all sleep modes

z

Wake-up on address match

z

Address match in hardware for:

z

7-bit unique address and/or 7-bit general call address

z

7-bit address range

z

Two unique 7-bit addresses

shift register

shift register

SDA

SCL

Tx DATA

Rx DATA

Tx DATA

Rx DATA

==

ADDR/ADDRMASK

BAUD

baud rate generator

SCL low hold

0

0

0

0