M95512-R datasheet(26/50 Pages) STMICROELECTRONICS

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Instructions

M95512-W M95512-R M95512-DR M95512-DF

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DocID11124 Rev 21

6.7

Read Identification Page (available only in M95512-D

devices)

The Identification Page (128 bytes) is an additional page which can be written and (later)

permanently locked in Read-only mode.

Reading this page is achieved with the Read Identification Page instruction (see Table 4).

The Chip Select signal (S) is first driven low, the bits of the instruction byte and address

bytes are then shifted in, on Serial Data Input (D). Address bit A10 must be 0, upper

address bits are Don't Care, and the data byte pointed to by the lower address bits [A6:A0]

is shifted out on Serial Data Output (Q). If Chip Select (S) continues to be driven low, the

internal address register is automatically incremented, and the byte of data at the new

address is shifted out.

The number of bytes to read in the ID page must not exceed the page boundary, otherwise

unexpected data is read (e.g.: when reading the ID page from location 90d, the number of

bytes should be less than or equal to 38d, as the ID page boundary is 128 bytes).

The read cycle is terminated by driving Chip Select (S) high. The rising edge of the Chip

Select (S) signal can occur at any time during the cycle. The first byte addressed can be any

byte within any page.

The instruction is not accepted, and is not executed, if a write cycle is currently in progress.

Figure 15. Read Identification Page sequence

Ai15966

9 10

20 21 22 23 24 25 26 27

14 13

28 29 30

76543

High impedance

Data Out 1

Instruction

16-bit address

MSB

Data Out 2

M95512-R Datasheet(PDF) 26 Page - STMicroelectronics