M95160-R datasheet(29/47 Pages) STMICROELECTRONICS

29 / 47 page

DocID022580 Rev 5

29/47

M95160 M95160-W M95160-R M95160-DF

Instructions

6.10

Lock ID (available only in M95160-D devices)

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, A10 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 4). 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.

Driving Chip Select (S) high at a byte boundary of the input data triggers the self-timed Write

cycle which duration is tW (specified in Section 9: DC and AC parameters). The instruction

sequence is shown in Figure 18.

The instruction is discarded, and is not executed, under the following conditions:

•

If the Write Enable Latch (WEL) bit has not been set to 1 (by executing a Write Enable

instruction just before).

•

If a Write cycle is already in progress.

•

If the device has not been deselected, by driving high Chip Select (S), at exactly a byte

boundary (after the eighth bit, b0, of the last data byte that has been latched in).

Figure 18. Lock ID sequence

M95160-R 데이터시트(PDF) 29 Page - STMicroelectronics