M24M02E-F datasheet(28/54 Pages) STMICROELECTRONICS

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6.5.4

Read operation on identification page

Following a start condition the bus controller sends a device select code with the R/W bit (RW) set to 0. The

device acknowledges this and waits for the address bytes where the identification page is located. The device

responds to each address byte with an acknowledge bit. Then, the bus controller sends another start condition,

and repeats the device select code, with the RW bit set to 1. The device acknowledges this, and outputs the

contents of the identification page. See in Table 9, Table 10, and Table 11 how to address the identification page.

After each byte read (data out), the device waits for an acknowledgment (data in) during the ninth bit time.

The output data of the identification page comes from consecutive addresses, with the internal address counter

automatically incremented after each byte output. After the last identification page address (FFh), the address

counter rolls-over, and the device continues to output data from identification page address 00h.

To terminate the stream of data byte, the bus controller must not acknowledge the byte, and must generate a stop

condition, as shown in Figure 21. Random read identification page.

If the bus controller does not acknowledge during this ninth time, the device terminates the data transfer as shown

in Figure 21. Random read identification page and switches to its standby mode.

Figure 21. Random read identification page

Dev sel *

Byte addr

Data out N

Random

Address

Read

Dev sel *

Data out

Dev sel *

Byte addr

Sequential

Random

Read

Dev sel *

Data out1

ACK

NO ACK

ACK

NO ACK

Note:

*: The seven most significant bits of the first device select code in a random read must match those of the device

select code in the write operation.

M24M02E-F

Instructions

DS14157 - Rev 2

page 28/54

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