MB85RC128

6

DS05–13110–3E

■ DEVICE ADDRESS WORD (Slave address)

Following the start condition, the bus master sends the 8bits device address word (Slave address) to start

code (3bits), and a read/write code (1bit).

• Device Type Code (4bits)

The upper 4 bits of the device address word are a device type code that identifies the device type, and are

fixed at “1010” for the MB85RC128.

• Device Address Code (3bits)

Following the device type code, the 3 bits of the device address code are input in order of A2, A1, and A0

pins. Each MB85RC128 is given a unique 3bits code on the device address pin (external hardware pin A2,

A1, and A0). When the device address code is received by the slave device, the slave only responds if the

hardware device address of which is equal to its unique 3bits code.

• Read/Write Code (1bit)

The 8th bit of the device address word is the R/W (read/write) code. When the R/W code is “L”, a write

operation is enabled, and the R/W code is “H”, a read operation is enabled for the MB85RC128.