ACE24C256C Datasheet, PDF (12/20 Pages) ACE Technology Co., LTD. – Two-wire serial EEPROM

ACE24C256C
Two-wire serial EEPROM
Figure12：Sequential Read
(D) 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 Read Identification Page
instruction which uses the same protocol and format as the Read Command (from memory array)
with device type identifier defined as 1011b. The MSB address bits A14/A6 are don’t care, the LSB
address bits A5/A0 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 54, as the ID page boundary
is 64 bytes).
(E) Read Lock Status
The locked/unlocked status of the Identification page can be checked by transmitting a specific
truncated command [Identification Page Write instruction + one data byte] to the device. The device
returns an acknowledge bit if the Identification page is unlocked, otherwise a NoACK bit if the
Identification page is locked.
Figure13：Lock Status Read (When Identification page locked,
return NoACK after one data byte)
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