Datasheet

276

SAM7X Series [DATASHEET]

6120K–ATARM–11-Feb-14

29.5.6 Read/Write Flowcharts

The following flowcharts shown in Figure 29-13, Figure 29-14 on page 277, Figure 29-15 on page 278, Figure 29-16 on

page 279, Figure 29-17 on page 280 and Figure 29-18 on page 281 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

Figure 29-13. TWI Write Operation with Single Data Byte without Internal Address

Set TWI clock

(CLDIV, CHDIV, CKDIV) in TWI_CWGR

(Needed only once)

Set the Control register:

- Master enable

TWI_CR = MSEN

Set the Master Mode register:

- Device slave address (DADR)

- Transfer direction bit

Write ==> bit MREAD = 0

Load Transmit register

TWI_THR = Data to send

Read Status register

TXRDY = 1?

Read Status register

TXCOMP = 1?

Transfer finished

Ye s

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