24C01B/02B

 2004 Microchip Technology Inc.

Preliminary

DS21233B-page 7

FIGURE 7-1:

CURRENT ADDRESS READ

FIGURE 7-2:

RANDOM READ

FIGURE 7-3:

SEQUENTIAL READ

8.0

PIN DESCRIPTIONS

8.1

Serial Data

This is a bi-directional pin used to transfer addresses

and data into and data out of the device. It is an open

drain terminal, therefore the SDA bus requires a pull-up

For normal data transfer SDA is allowed to change only

during SCL low. Changes during SCL high are

reserved for indicating the START and STOP condi-

tions.

8.2

SCL Serial Clock

This input is used to synchronize the data transfer from

and to the device.

8.3

WP

(read/write the entire memory).

entire memory will be write-protected. Read operations

are not affected.

This feature allows the user to use the 24C01B/02B as

SP

BUS ACTIVITY

MASTER

SDA LINE

BUS ACTIVITY

S

T

A

R

T

CONTROL

BYTE

DATA n

A

C

K

N

O

A

C

K

S

T

O

P

S

P

S

BUS ACTIVITY

MASTER

SDA LINE

BUS ACTIVITY

S

T

A

R

T

S

T

O

P

CONTROL

BYTE

WORD

ADDRESS (n)

DATA n

A

C

K

A

C

K

N

O

A

C

K

CONTROL

BYTE

A

C

K

S

T

A

R

T

P

SDA LINE

BUS ACTIVITY

S

T

O

P

CONTROL

BYTE

DATA n

A

C

K

N

O

A

C

K

A

C

K

A

C

K

A

C

K

DATA n + 1

DATA n + 2

DATA n + X

BUS ACTIVITY

MASTER