Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Data Sheet

 573

SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

Write Access Ordered by a Master

Notes:

1. When SVACC is low, the state of SVREAD becomes irrelevant.

2. RXRDY is set when data has been transmitted from  the shift register to the TWI_RHR and reset when this data is read.

The general call is performed in order to change the address of the slave.

If a GENERAL CALL is detected, GACC is set.

After the detection of General Call, it is up to the programmer to decode the commands which come afterwards.

In case of a WRITE command, the programmer has to decode the programming sequence and program a new
SADR if the programming sequence matches.

 describes the General Call access.

Master Performs a General Call 

Note:

This method allows the user to create an own programming sequence by choosing the programming bytes and the 
number of them. The programming sequence has to be provided to the master.

RXRDY

Read RHR

SVREAD has to be taken into account only while SVACC is active

TWD

SVACC

SVREAD

EOSVACC

SADR does not match,

TWI answers with a NACK

SADR

S

ADR

W

NA

W

A

DATA

A

A

DATA

NA

S/Sr

DATA

NA

P/S/Sr

SADR matches,

TWI answers with an ACK

0000000 + W

GENERAL CALL

P

S

A

GENERAL CALL

Reset or write DADD

A

New SADR

DATA1

A

DATA2

A

A

New SADR

Programming se uence

TXD

GCACC

SVACC

RESET command = 00000110X

WRITE command = 00000100X

Reset after read