SLx 24C01/02/P

Semiconductor Group

15

1998-07-27

6

Read Operations

Reading of the EEPROM data is initiated by the Master with the command byte CSR.

6.1

Random Read

Random read operations allow the master to access any memory location.

Figure 11

Random Read

Address Setting

The master generates a START condition followed by the

command byte CSW. The receipt of the CSW-byte is

acknowledged by the EEPROM with a low on the SDA line.

Now the master transmits the EEPROM address (EEA) to the

EEPROM and the internal address counter is loaded with the

desired address.

Transmission of CSR

After the acknowledge for the EEPROM address is received,

the master generates a START condition, which terminates

the initiated write operation. Then the master transmits the

command byte CSR for read, which is acknowledged by the

EEPROM.

Transmission of

EEPROM Data

During the next eight clock pulses the EEPROM transmits the

data byte and increments the internal address counter.

STOP Condition from

Master

During the following clock cycle the masters releases the bus

and then transmits the STOP condition.

Command Byte

CSW

S

P

A

C

K

C

K

A

S

T

A

R

T

T

P

O

S

EEPROM Address

EEA n

Bus Activity

Master

SDA Line

Bus Activity

EEPROM

IED02133

C

K

A

Data Byte

1

0

S

T

R

A

T

S

CSR

Command Byte