ACE24LA64A

Two-wire Serial EEPROM

VER 1.1

8

Sequential Read:

Sequential reads are initiated by either a current address read or a random address read. After the

microcontroller receives a data word, it responds with an acknowledge. As long as the EEPROM

receives an acknowledge, it will continue to increment the data word address and serially clock out

sequential data words. When

the memory address limit is reached, the data word address will “roll over”

and the sequential read will continue. The sequential read operation is terminated when the

microcontroller does not respond with a

“0” but does generate a following stop condition (see Figure 9).

Read Identification Page:

The Identification Page (32 bytes) is an additional page which can be

written and (later) permanently

locked in Read-only mode.

The Identification Page can be read by issuing an Read Identification Page instruction. This instruction

uses the same protocol and format as the Random Address Read (from memory array) with device type

identifier defined as 1011b. The MSB address bits B15/B6 are don't care, the LSB address bits B5/B0

define the byte address inside the Identification Page. The number of bytes to read in the ID page must

not exceed the page boundary (e.g.: when reading the Identification Page from location 10d, the number

of bytes should be less than or equal to 22, as the ID page boundary is 32 bytes)

Lock Identification Page:

The Lock Identification Page instruction (Lock ID) permanently locks the Identification page in Read-only

mode. The Lock ID instruction is similar to Byte Write (into memory array) with the following specific

conditions:

Device type identifier = 1011b

Address bit B10 must be „1‟; all other address bits are don't care

The data byte must be equal to the binary value xxxx xx1x, where x is don't care

B15

B14

B13

B12

B11

B10

B9

B8

Table 2.First Word Address

B7

B6

B5

B4

B3

B2

B1

B0

Table 3.Second Word Address

Figure 4: Device Address