S24022 datasheet(7/14 Pages) SUMMIT

Part #	S24022

Description	Precision RESET Controller and 2K I2C Memory With Both RESET and RESET Outputs

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Manufacturer	SUMMIT [Summit Microelectronics, Inc.]

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7 / 14 page

S24022/S24023

7

2010 1.4 5/3/98

FIGURE 8. RANDOM ADDRESS BYTE READ MODE

Random Address Byte Read

Random address read operations allow the master to

access any memory location in a random fashion. This

operation involves a two-step process. First, the master

issues a write command which includes the start condi-

tion and the slave address field (with the R/W bit set to

WRITE) followed by the address of the word it is to read.

This procedure sets the internal address counter of the

S24022/23 to the desired address.

After the word address acknowledge is received by the

master, the master immediately reissues a start condition

followed by another slave address field with the R/W bit

set to READ. The S24022/23 will respond with an ac-

knowledge and then transmit the 8-data bits stored at the

addressed location. At this point, the master does not

acknowledge the transmission but does generate the stop

condition. The S24022/23 discontinues data transmis-

sion and reverts to its standby power mode. See Figure 8

for the address, acknowledge and data transfer se-

quence.

D

7

D

6

D

5

D

4

D

3

D

2

D

1

D

0

A

7

A

6

A

5

A

4

A

3

A

2

A

1

A

0

S

T

A

R

T

S

T

O

P

A

C

K

Slave Address

Device

Type

Address

Read/Write

0= Write

Device

Type

Address

SDA Bus

Activity

S

T

A

R

T

Read/Write

1= Read

A

C

K

A

C

K

Master sends Read

request to Slave

Master Writes Word

Address to Slave

Master Requests

Data from Slave

Slave sends

Data to Master

10 1 0

1

0

XX

R

W

XX

R

W

XX

Lack of ACK (low)

from Master

determines last

data byte to be read

1

Slave Transmitter

to

Master Receiver

Slave Transmitter

to

Master Receiver

Shading Denotes

24022/23

SDA Output Active

Slave Transmitter

to

Master Receiver

Master Transmitter

to

Slave Receiver

Master Transmitter

to

Slave Receiver

Master Transmitter

to

Slave Receiver

Slave Transmitter

to

Master Receiver

Data Byte

2010 ILL11 1.2

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S24022 Datasheet(PDF) 7 Page - Summit Microelectronics, Inc.

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