Specifications

118
3706C–MICRO–2/11
AT89LP3240/6440
Figure 18-11. Format and States in Master Transmitter Mode
18.6.2 Master Receiver Mode
In the Master Receiver mode, a number of data bytes are received from a slave transmitter. In
order to enter a Master mode, a START condition must be transmitted. The format of the follow-
ing address packet determines whether Master Tra nsmitter or Master Receiver mode is to be
entered. If SLA+W is transmitted, MT mode is entered, if SLA+R i
s transmitted, MR mode is
entered.
S SLA W A DATA A P
08h
18h 28h
R SLA W
10h
AP
20h
P
30h
A or A
38h
A
Other master
continues
A or A
38h
Other master
continues
R
A
68h
Other master
continues
78h B0h
To corresponding
states in slave mode
MT
MR
Successfull
transmission
to a slave
receiver
Next transfer
started with a
repeated start
condition
Not acknowledge
received after the
slave address
Not acknowledge
received after a data
byte
Arbitration lost in slave
address or data byte
Arbitration lost and
addressed as slave
DATA A
n
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
S