Operation M41T01
10/24 DocID025389 Rev 2
2.2 READ mode
In this mode, the master reads the M41T01 slave after setting the slave address (see
Figure 6). Following the WRITE mode control bit (R/W = 0) and the acknowledge bit, the
word address An is written to the on-chip address pointer. Next the START condition and
slave address are repeated, followed by the READ mode control bit (R/W = 1). At this point,
the master transmitter becomes the master receiver. The data byte which was addressed
will be transmitted and the master receiver will send an acknowledge bit to the slave
transmitter. The address pointer is only incremented on reception of an acknowledge bit.
The M41T01 slave transmitter will now place the data byte at address A
n+1
on the bus. The
master receiver reads and acknowledges the new byte and the address pointer is
incremented to A
n+2
.
This cycle of reading consecutive addresses will continue until the master receiver sends a
STOP condition to the slave transmitter.
An alternate READ mode may also be implemented, whereby the master reads the M41T01
slave without first writing to the (volatile) address pointer. The first address that is read is the
last one stored in the pointer (see Figure 7 on page 11).
Figure 6. Slave address location
AI00602
R/W
SLAVE ADDRESS
START A
0100011
MSB
LSB
