Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Fiche De Données

Codes de produits

ATSAM4E-XPRO

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

838

Figure 36-21. TWI Read Operation with Multiple Data Bytes with or without Internal Address

Internal address size = 0?

Start the transfer

TWI_CR = START

Stop the transfer

TWI_CR = STOP

Read Status register

RXRDY = 1?

Last data to read

but one?

Read status register

TXCOMP = 1?

END

Set the internal address

TWI_IADR = address

Yes

Read Receive Holding register (TWI_RHR)

Set the Control register:

- Master enable

TWI_CR = MSEN + SVDIS

Set the Master Mode register:

- Device slave address

- Internal address size (if IADR used)

- Transfer direction bit

Read ==> bit MREAD = 1

BEGIN

Set TWI clock

(CLDIV, CHDIV, CKDIV) in TWI_CWGR

(Needed only once)

Read Status register

RXRDY = 1?

Yes

Read Receive Holding register (TWI_RHR)