Datasheet

DocID12943 Rev 14 13/47

M24M01-R M24M01-DF Device operation

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

Table 2 (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 8

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 9

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)

1. The most significant bit, b7, is sent first.

Chip Enable

address

(2)

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

Address

bit

When accessing

the memory

b7 b6 b5 b4 b3 b2 b1 b0

1 0 1 0 E2 E1 A16 RW

When accessing

the Identification

page

1011E2E1X

(3)

3. X = don’t care.