BL24C64A 64Kbits (8,192×8)

BL24C64A 64Kbits (8,192×8) Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited

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7-17

microcontroller does not respond with a "0" but does generate a following stop condition (see Figure

10).

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

Table 3. FIRST WORD ADDRESS

B15

B14

B13

B12

B11

B10

B9

B8

Table 4. SECOND WORD ADDRESS

B7

B6

B5

B4

B3

B2

B1

B0

Figure 5. Device Address

1

0

1

0

A2

A1

A0

R/W

MSB

LSB

Figure 6. Byte Write

SDA

LINE

S

T

A

R

T

DEVICE

ADDRESS

W

R

I

T

E

M

S

B

L

S

B

R

/

W

A

C

K

FIRST WORD

ADDRESS

SECOND WORD

ADDRESS

A

C

K

L

S

B

A

C

K

L

S

B

A

C

K

L

S

B

S

T

O

P

DATA