M95040-DF datasheet(26/46 Pages) STMICROELECTRONICS

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Instructions

M950x0-W M950x0-R M950x0-DF

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DocID6512 Rev 13

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 tW (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.

M95040-DF データシート(PDF) 26 Page - STMicroelectronics