ST24E64EB3TR datasheet(10/16 Pages) STMICROELECTRONICS

10 / 16 page

BYTE WRITE

DEV SEL

BYTE ADDR

DATA IN

PAGE WRITE

DEV SEL

BYTE ADDR

DATA IN 1

DATA IN 2

AI01106

PAGE WRITE

(cont’d)

WC (cont’d)

DATA IN N

ACK

R/W

ACK

R/W

ACK

Figure 8. Write Modes Sequence with Write Control = 0

Read Operations

On delivery, the memory content is set at all ”1’s”

(or FFh).

Current Address Read. The ST24/25E64 have

an internal 13 bits address counter. Each time a

byte is read, this counter is incremented. For the

Current Address Read mode, following a START

condition, the master sends a Device Select with

the RW bit set to ’1’. The ST24/25E64acknowledge

this and outputs the byte addressed by the internal

address counter. This counter is then incremented.

The master does NOT acknowledge the byte out-

put, but terminates the transfer with a STOP con-

dition.

Random Address Read. A dummy write is per-

formed to load the address into the address

counter, see Figure 10. This is followed by another

START condition from the master and the byte

address repeated with the RW bit set to ’1’. The

ST24/25E64 acknowledge this and outputs the

byte addressed. The master does NOT acknow-

ledge the byte output, but terminates the transfer

with a STOP condition.

Sequential Read. This mode can be initiated with

either a Current Address Read or a Random Ad-

dress Read. However, in this case the master

DOES acknowledge the data byte output and the

ST24/25E64 continue to output the next byte in

10/16

ST24E64, ST25E64

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