BL24C256A Datasheet, PDF (7/18 Pages) SHANGHAI BELLING CO., LTD. – Single supply voltage and high speed

BL24C256A 256Kbits (32768×8)
microcontroller does not respond with a "0" but does generate a following stop condition (see Figure
10).
READ IDENTIFICATION PAGE: The Identification Page (64 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 64 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
MSB
1
0
1
LSB
0
A2
A1
A0
R/W
Figure 6. Byte Write
S
W
T
A ^DEVICE
R ^ADDRESS
R
I
T
T
E
SDA
LINE
M
LRA
S
S /C
B
BWK
FIRST WORD
ADDRESS
SECOND WORD
ADDRESS
LA
LA
SC
SC
BK
BK
S
T
DATA
O
P
LA
SC
BK
Note.1*=DON'T’T CARE bits
BL24C256A 256Kbits (32768×8) Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
7-18
© 2016 Belling All Rights Reserved www.belling.com.cn