Rainbow Electronics AT91CAP9S250A - Manual (Page 509)

509
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
34.9.6 Read Write Flowcharts
The flowchart shown in Figure 34-31 on page 509 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 34-31. 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