M95160-R datasheet(26/47 Pages) STMICROELECTRONICS

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Instructions

M95160 M95160-W M95160-R M95160-DF

26/47

DocID022580 Rev 4

6.7

Read Identification Page (available only in M95160-D

devices)

The Read Identification Page (RDID) instruction is used to read the Identification Page

(additional page of 32 bytes which can be written and later permanently locked in Read-only

mode).

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

bytes are then shifted in (MSB first) on Serial Data input (D). Address bit A10 must be 0,

other upper address bits are Don't Care (it might be easier to define these bits as 0, as

shown in Table 4). The data byte pointed to by the lower address bits [A4:A0] is shifted out

(MSB first) on Serial Data output (Q).

The first byte addressed can be any byte within the identification page.

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.

Note that there is no roll over feature in the Identification Page. The address of bytes to read

must not exceed the page boundary.

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 when the data bits are shifted out.

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

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