M95040-DRMF3TP datasheet(23/41 Pages) STMICROELECTRONICS

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M95040-A125 M95040-A145

Instructions

The read cycle is terminated by driving Chip Select (S) high. The instruction sequence is

shown in Figure 14.

The Read Lock Status instruction is not accepted and not executed if a Write cycle is

currently in progress.

Figure 14. Read Lock Status sequence

4.10

Lock Identification Page (LID)

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 6). 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 15. Lock ID sequence

M95040-DRMF3TP Datasheet(PDF) 23 Page - STMicroelectronics