Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD データシート

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SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

The flowchart shown in 

 gives an example of read and write operations in Multi-master mode.

Programm the SLAVE mode:

SADR + MSDIS + SVEN

SVACC = 1

TXCOMP = 1

GACC = 1

Decoding of the

programming sequence

Prog seq

OK

Change SADR

SVREAD = 1

Read Status Register

RXRDY= 1

Read TWI_RHR

TXRDY= 1

EOSACC = 1

Write in TWI_THR

Need to perform

a master access

Program the Master mode

DADR + SVDIS + MSEN + CLK + R / W

Read Status Register

ARBLST = 1

MREAD = 1

TXRDY= 0

Write in TWI_THR

Data to send

RXRDY= 0

Read TWI_RHR

Data to read

Read Status Register

TXCOMP = 0

GENERAL CALL TREATMENT

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Stop Transfer

TWI_CR = STOP

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

START