S24023SB datasheet(5/14 Pages) SUMMIT

Part #	S24023SB

Description	Precision RESET Controller and 4K I2C Memory With Both RESET and RESET Outputs

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Manufacturer	SUMMIT [Summit Microelectronics, Inc.]

Direct Link	http://www.summitmicro.com

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5 / 14 page

S24042/S24043

5

2011 2.1 8/2/00

SUMMIT MICROELECTRONICS, Inc.

FIGURE 5. PAGE/BYTE WRITE MODE

WRITE OPERATIONS

The S24042/43 allows two types of write operations: byte

write and page write. The byte write operation writes a

single byte during the nonvolatile write period (tWR). The

page write operation allows up to 16 bytes in the same

page to be written during tWR.

Byte WRITE

Upon receipt of the slave address and word address, the

S24042/43 responds with an ACKnowledge. After receiv-

ing the next byte of data, it again responds with an

ACKnowledge. The master then terminates the transfer

by generating a STOP condition, at which time the

S24042/43 begins the internal write cycle.

While the internal write cycle is in progress, the S24042/

43 inputs are disabled, and the device will not respond to

any requests from the master. Refer to Figure 5 for the

address, ACKnowledge and data transfer sequence.

Page WRITE

The S24042/43 is capable of a 16-byte page write opera-

tion. It is initiated in the same manner as the byte-write

operation, but instead of terminating the write cycle after

the first data word, the master can transmit up to 15 more

bytes of data. After the receipt of each byte, the S24042/

43 will respond with an ACKnowledge.

The S24042/43 automatically increments the address for

subsequent data words. After the receipt of each word,

the low order address bits are internally incremented by

one. The high order five bits of the address byte remain

constant. Should the master transmit more than 16 bytes,

prior to generating the STOP condition, the address

counter will “roll over,” and the previously written data will

be overwritten. As with the byte-write operation, all inputs

are disabled during the internal write cycle. Refer to

Figure 5 for the address, ACKnowledge and data transfer

sequence.

Read/Write Bit

The last bit of the data stream defines the operation to be

performed. When set to “1,” a read operation is selected;

when set to “0,” a write operation is selected.

D

7

D

6

D

5

D

4

D

3

D

2

D

1

D

0

D

7

D

6

D

5

D

4

D

3

D

2

D

1

D

0

A

7

A

8

A

8

A

6

A

5

A

4

A

3

A

2

A

1

A

0

D

7

D

5

D

6

D

4

D

0

D

3

D

2

D

1

S

T

A

R

T

Word Address

Data Byte n

Data Byte n+15

S

T

O

P

A

C

K

Acknowledges Transmitted from

24042/43 to Master Receiver

Slave Address

Device

Type

Address

Read/Write

0= Write

SDA

Bus

Activity

A

C

K

A

C

K

Master Sends Read

Request to Slave

Master Writes Word

Address to Slave

1 0 1 0

0

Data Byte n+1

A

C

K

Master Writes

Data to Slave

Master Transmitter

to

Slave Receiver

Slave Transmitter

to

Master Receiver

Slave Transmitter

to

Master Receiver

Master Transmitter

to

Slave Receiver

Master Transmitter

to

Slave Receiver

Shading Denotes

24042/43

SDA Output Active

Master Transmitter

to

Slave Receiver

Slave Transmitter

to

Master Receiver

Slave Transmitter

to

Master Receiver

Master Transmitter

to

Slave Receiver

Slave Transmitter

to

Master Receiver

Master Writes

Data to Slave

Master Writes

Data to Slave

Acknowledges Transmitted from

24042/43 to Master Receiver

If single byte-write only,

Stop bit issued here.

XX

R

W

A

C

K

2011 ILL8 1.0

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