X24C04-2.7 データシートの表示（PDF） - Xicor -> Intersil

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X24C04-2.7

Serial EEPROM

Xicor -> Intersil 

X24C04

Figure 5. Byte Write

S

Bus Activity: T

Master A

R

T

SDA Bus S

Slave

Address

Word Address

S

Data

T

O

P

P

Bus Activity:

X24C04

A

A

A

C

C

C

K

K

K

Page Write

The X24C04 is capable of a sixteen byte page write

operation. It is initiated in the same manner as the byte

write operation, but instead of terminating the write

cycle after the first data word is transferred, the master

can transmit up to fifteen more words. After the receipt

of each word, the X24C04 will respond with an

acknowledge.

After the receipt of each word, the four low order

address bits are internally incremented by one. The

high order five bits of the address remain constant. If

the master should transmit more than sixteen words

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 until completion of the internal write

cycle. Refer to Figure 6 for the address, acknowledge

and data transfer sequence.

Figure 6. Page Write

S

Bus Activity: T

Master A

R

T

SDA Line S

Slave

Address

Bus Activity:

X24C04

Word

Address (n)

Data n

Data n + 1

A

A

A

A

C

C

C

C

K

K

K

K

Note: In this example n = xxxx 000 (B); x = 1 or 0

S

Data n + 15

T

O

P

P

A

C

K

Acknowledge Polling

The disabling of the inputs can be used to take advan-

tage of the typical 5 ms write cycle time. Once the stop

condition is issued to indicate the end of the host’s

write operation, the X24C04 initiates the internal write

cycle. ACK polling can be initiated immediately. This

involves issuing the start condition, followed by the

slave address for a write operation. If the X24C04 is still

busy with the write operation no ACK will be returned.

If the X24C04 has completed the write operation an

ACK will be returned, and the host can then proceed

with the next read or write operation. Refer to Flow 1.

REV 1.1.3 11/28/00

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Characteristics subject to change without notice. 5 of 13

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