Atmel Evaluation Kit AT91SAM9G25-EK AT91SAM9G25-EK Data Sheet

Product codes

AT91SAM9G25-EK

764

SAM9G25 [DATASHEET]

11032D–ATARM–10-Mar-2014

37.10.6 Read Write Flowcharts

The flowchart shown in

Figure 37-33 on page 764

gives an example of read and write operations in Slave mode. 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.

Figure 37-33.Read Write Flowchart in Slave Mode

Set the SLAVE mode:

SADR + MSDIS + SVEN

SVACC = 1 ?

TXCOMP = 1 ?

GACC = 1 ?

Decoding of the

programming sequence

Prog seq

OK ?

Change SADR

SVREAD = 0 ?

Read Status Register

RXRDY= 0 ?

Read TWI_RHR

TXRDY= 1 ?

EOSACC = 1 ?

Write in TWI_THR

END

GENERAL CALL TREATMENT