Datasheet

Instructions M950x0-W M950x0-R M950x0-DF
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6.8 Write Identification Page (available only in M95040-D device)
The Write Identification Page (WRID) instruction is used to write the Identification Page
(additional page of 16 bytes which can also be permanently locked in Read-only mode).
The Chip Select signal (S) is first driven low, and then the bits of the instruction byte,
address bytes, and at least one data byte are shifted in (MSB first) on Serial Data input (D).
Address bit A7 must be 0 and the other address bits are Don't Care except the lower
address bits [A3:A0] (it might be easier to define these bits as 0, as shown in
Table 5).
The self-timed Write cycle starts from the rising edge of Chip Select (S), and continues for a
period t
W
(as specified in Chapter 9: DC and AC parameters).
Figure 15. Write Identification Page sequence
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.
MS31631V1
C
D
S
Q
A7
21 345678910111213141516171819
A6 A5 A4 A3 A2 A1 A0
20 21 22 23
High Impedance
Instruction Byte Address
0
765432 0
1
Data Byte