M24M01-R_12 datasheet(13/38 Pages) STMICROELECTRONICS

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M24M01-R M24M01-DF

Device operation

Doc ID 12943 Rev 10

13/38

4.5

Device addressing

To start communication between the bus master and the slave device, the bus master must

initiate a Start condition. Following this, the bus master sends the device select code, shown

in Table 2 (on Serial Data (SDA), most significant bit first).

When the device select code is received, the device only responds if the Chip Enable

address is the same as the value on its Chip Enable E2,E1 inputs.

The 8th bit is the Read/Write bit (RW). This bit is set to 1 for Read and 0 for Write operations.

If a match occurs on the device select code, the corresponding device gives an

acknowledgment on Serial Data (SDA) during the 9th bit time. If the device does not match

the device select code, the device deselects itself from the bus, and goes into Standby

mode.

Table 2.

Device select code

Device type identifier(1)

The most significant bit, b7, is sent first.

Chip Enable

address(2)

E2,E1 are compared against the external pin on the memory device.

Address

bit

When accessing

the memory

A16

When accessing

the Identification

page

X(3)

X = don’t care.

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