AT89LP6440 datasheet(119/194 Pages) ATMEL

119 / 194 page

119

3706A–MICRO–9/09

AT89LP6440 - Preliminary

Figure 18-12. Format and States in Master Receiver Mode

18.6.3

Slave Receiver Mode

In the Slave Receiver mode, a number of data bytes are received from a master transmitter. To

initiate the Slave Receiver mode, TWAR and TWCR must be initialized as follows:

The upper seven bits are the address to which the Two-wire Serial Interface will respond when

addressed by a master. If the LSB is set, the TWI will respond to the general call address (00h),

otherwise it will ignore the general call address.:

SLA

DATA

08h

40h

50h

SLA

10h

48h

A or A

38h

Other master

continues

38h

Other master

continues

68h

Other master

continues

78h

B0h

To corresponding

states in slave mode

Successfull

reception

from a slave

receiver

Next transfer

started with a

repeated start

condition

Not acknowledge

received after the

slave address

Arbitration lost in slave

address or data byte

Arbitration lost and

addressed as slave

DATA

From master to slave

From slave to master

Any number of data bytes

and their associated acknowledge bits

This number (contained in TWSR) corresponds

to a defined state of the Two-wire Serial Bus. The

prescaler bits are zero or masked to zero

DATA

58h

TWAR

TWA6

TWA5

TWA4

TWA3

TWA2

TWA1

TWA0

ValueDevice’s own Slave Address

TWCR

–TWEN

STA

STO

TWIF

–

Value

100

AT89LP6440 Datasheet(PDF) 119 Page - ATMEL Corporation

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