M41TC8025CMC7F datasheet(11/41 Pages) STMICROELECTRONICS

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M41TC8025

Operation

2.2.6

READ mode

In this mode the master reads the M41TC8025 slave after setting the slave address (see

Table 3 on page 11). 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

clock. The M41TC8025 slave transmitter will now place the data byte at address An+1 on

the bus, the master receiver reads and acknowledges the new byte and the address pointer

is incremented to "An+2." (see Figure 7 on page 12).

This cycle of reading consecutive addresses will continue until the master receiver sends a

STOP condition to the slave transmitter. Once the address pointer reaches the register 0Fh,

it will roll over to 00h automatically.

Note:

The address pointer rolling over is true both in READ mode and WRITE mode.

An alternate READ mode may also be implemented whereby the master reads the

M41TC8025 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 8 on page 12).

Note:

If an undefined register address is selected by the master, the M41TC8025 address pointer

will not change. For a read command, the undefined register address will not be

acknowledged and the first address that is read is the last one stored in the pointer (the

M41TC8025 works in the alternate read mode). For a write command, the undefined

Table 3. Slave address byte

Command

Slave address

R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Read (65h)

Write (64h)

MSB

LSB

Obsolete

Product(s)

- Obsolete

Product(s)

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