Atmel SAM4S Xplained Pro Starter and Evaluation Kit ATSAM4S-XPRO ATSAM4S-XPRO Data Sheet

Product codes

ATSAM4S-XPRO

711

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

Figure 34-19. TWI Read Operation with Single Data Byte and Internal Address

Set the Control register:

- Master enable

TWI_CR = MSEN + SVDIS

Set the Master Mode register:

- Device slave address

- Internal address size (IADRSZ)

- Transfer direction bit

Read ==> bit MREAD = 1

Read Status register

TXCOMP = 1?

END

BEGIN

Yes

Set TWI clock

(CLDIV, CHDIV, CKDIV) in TWI_CWGR

(Needed only once)

Yes

Set the internal address

TWI_IADR = address

Start the transfer

TWI_CR = START | STOP

Read Status register

RXRDY = 1?

Read Receive Holding register