Atmel Evaluation Kit AT91SAM9G25-EK AT91SAM9G25-EK Data Sheet

748

SAM9G25 [DATASHEET]

11032D–ATARM–10-Mar-2014

The TWI interface can perform a Quick Command:

1.

Configure the master mode (DADR, CKDIV, etc.).

2.

Write the MREAD bit in the TWI_MMR register at the value of the one-bit command to be sent.

3.

Start the transfer by setting the QUICK bit in the TWI_CR.

The following flowcharts shown in 

, 

, 

 give examples for read and write operations. A polling or 

interrupt method can be used to check the status bits. The interrupt method requires that the interrupt enable register 
(TWI_IER) be configured first.

TXCOMP

TXRDY

Write QUICK command in TWI_CR

TWD

A

S

DADR

R/W

P