X24C04 datasheet(7/18 Pages) XICOR

7 / 18 page

X24C04

Current Address Read

Internally the X24C04 contains an address counter that

maintains the address of the last word accessed,

incremented by one. Therefore, if the last access (either

a read or write) was to address n, the next read operation

would access data from address n + 1. Upon receipt of

the slave address with the R/

W bit set to one, the

X24C04 issues an acknowledge and transmits the eight

bit word. The read operation is terminated by the master;

by not responding with an acknowledge and by issuing

a stop condition. Refer to Figure 7 for the sequence of

address, acknowledge and data transfer.

Random Read

Random read operations allow the master to access

any memory location in a random manner. Prior to

issuing the slave address with the R/

W bit set to one,

the master must first perform a “dummy” write opera-

tion. The master issues the start condition, and the

slave address followed by the word address it is to read.

After the word address acknowledge, the master im-

mediately reissues the start condition and the slave

address with the R/

W bit set to one. This will be followed

by an acknowledge from the X24C04 and then by the

eight bit word. The read operation is terminated by the

master; by not responding with an acknowledge and by

issuing a stop condition. Refer to Figure 8 for the

address, acknowledge and data transfer sequence.

Figure 7. Current Address Read

BUS ACTIVITY:

MASTER

SDA LINE

BUS ACTIVITY:

X24C04

SLAVE

ADDRESS

DATA

3839 FHD F13

Figure 8. Random Read

3839 FHD F14

BUS ACTIVITY:

MASTER

SDA LINE

BUS ACTIVITY:

X24C04

SLAVE

ADDRESS

WORD

ADDRESS n

SLAVE

ADDRESS

DATA n

X24C04 データシート(PDF) 7 Page - Xicor Inc.

X24C04 データシート(HTML) 7 Page - Xicor Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

データシートダウンロード

リンク URL

X24C04 データシート(PDF) 7 Page - Xicor Inc.

X24C04 データシート(HTML) 7 Page - Xicor Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

データシート ダウンロード

リンク URL

データシートダウンロード