M14C64 datasheet(4/14 Pages) STMICROELECTRONICS

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M14C64, M14C32

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Memory Addressing

To start communication between the bus master

and the slave memory, the master must initiate a

START condition. Following this, the master sends

8 bits to the SDA bus line (with the most significant

bit first). These bits represent the Device Select

Code (7 bits) and a RW bit.

The seven most significant bits of the Device Se-

lect Code are the Device Type Identifier, according

to the I2C bus definition. For the memory device,

Figure 5. I2C Bus Protocol

SCL

SDA

SCL

SDA

START

CONDITION

SDA

INPUT

SDA

CHANGE

AI00792

STOP

CONDITION

MSB

ACK

START

CONDITION

SCL

MSB

ACK

STOP

CONDITION

Table 5. Device Select Code 1

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

Device Code

Chip Enable

Device Select

1010000

Note: 1. b15 to b13 are Don’t Care on the M14C64 series.

b15 to b12 are Don’t Care on the M14C32 series.

Table 3. Most Significant Byte

b15

b14

b13

b12

b11

b10

Table 4. Least Significant Byte

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