Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet

Product codes

AT91SAM9N12-EK

732

SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]

11063K–ATARM–05-Nov-13

39.10.7 Read Write Flowcharts

The flowchart shown in

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 39-33. 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