M95P16-IXCSSLASHEF datasheet(35/63 Pages) STMICROELECTRONICS

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6.16

Read identification (83h)

The Read identification (RDID) instruction allows one or more data bytes in the two identification pages (512

bytes each) to be read sequentially:

•

The first page contains three device identification bytes.

•

In the case of an UID, one byte for length, and an unique ID value on N bytes, as specified in UID length

(see Table 13).

•

The second page is located at the address 200h. It is delivered erased, available for customer data.

Table 13. Identification page content

Address (in the first identification page)

Content

Value

00h

ST manufacturer code

20h

01h

SPI family code

00h

02h

Memory density code

15h (16 Mbit)

03h

UID length

00h

04h

UID

FFh

Note:

The first three bytes (address 00h, 01h and 02h) of the identification page can also be read with the Read

JEDEC identification (JDID) instruction.

The RDID instruction is initiated by driving the S pin low and shifting the instruction code 83h, followed by a 24-bit

address (A23-A0) into the D-DQ0 pin.

The data byte pointed to by the lower address bits [A9:A0] is shifted out (MSB first) on the Serial Data output (Q),

as shown in Figure 26. The address is automatically incremented to the next higher address of the identification

pages after each data byte is shifted out, thus enabling a continuous stream of data. This means that the entire

area of identification pages (1024 bytes) can be accessed with a single instruction as long as the clock continues

to cycle. The instruction is completed by driving S high.

Figure 26. Read identification

4121 4122 4123 4124 4125 4126 4127 4128

A23 A22 A21

High impedance

RDID instruction

24-bit address

ST manufacturer code

SPI Family code

Memory density code

UID length or data out 4

UID or data out 5

data out 512

MS69257V1

M95P16-I M95P16-E

Read identification (83h)

DS13710 - Rev 1

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