Datasheet

M24C64-DF, M24C64-W, M24C64-R, M24C64-F Device operation
Doc ID 16891 Rev 21 17/43
Figure 10. Write mode sequences with WC = 0 (data write enabled)
4.9 Write Identification Page (M24C64-D only)
The Identification Page (32 bytes) is an additional page which can be written and (later)
permanently locked in Read-only mode. The Identification Page is written by issuing an
Write Identification Page instruction. This instruction uses the same protocol and format as
Page Write (into memory array), except for the following differences:
● Device type identifier = 1011b
● MSB address bits A15/A5 are don't care except for address bit A10 which must be ‘0’.
LSB address bits A4/A0 define the byte address inside the Identification Page.
If the Identification Page is locked, the data bytes transferred during the Write Identification
Page instruction are not acknowledged (NoAck).
Stop
Start
Byte Write Dev Select Byte address
Byte address Data in
WC
Start
Page Write Dev Select Byte address Byte address Data in 1
WC
Data in 2
AI01106d
Page Write
(cont'd)
WC (cont'd)
Stop
Data in N
ACK
R/W
ACK ACK ACK
ACK ACK ACK ACK
R/W
ACKACK