Datasheet

Instructions M950x0-W M950x0-R M950x0-DF
28/45 DocID6512 Rev 12
6.10 Lock Identification Page (available only in M95040-D device)
The Lock Identification Page (LID) command is used to permanently lock the Identification
Page in Read-only mode.
The LID instruction is issued by driving Chip Select (S) low, sending (MSB first) the
instruction code, the address and a data byte on Serial Data input (D), and driving Chip
Select (S) high. In the address sent, A7 must be equal to
1. All other address bits are Don't
Care (it might be easier to define these bits as 0, as shown in
Table 5). The data byte sent
must be equal to the binary value xxxx xx1x, where x = Don't Care. The LID instruction is
terminated by driving Chip Select (S) high at a data byte boundary, otherwise, the instruction
is not executed.
Figure 17. Lock ID sequence
Driving Chip Select (S) high at a byte boundary of the input data triggers the self-timed Write
cycle which duration is t
W
(specified in Chapter 9: DC and AC parameters). The instruction
sequence is shown in Figure 17.
The instruction is discarded, and is not executed if the Block Protect bits (BP1,BP0) = (1,1)
or one of the conditions defined in
Section 4.3: Data protection and protocol control is not
satisfied.
C
D
MS31632V1
S
Q
7
21 345678910 1314151617181920
65 3210
21 22 23
High impedance
Instruction 8-bit address
0
765432 0
1
Data byte
24 25