M95P16-IXMCSLASHEF datasheet(37/63 Pages) STMICROELECTRONICS

37 / 63 page

6.18

Write identification page (82h)

The WRID instruction is used to write the identification page.

To write this page, a Write enable (06h) instruction must have been executed previously for the device to accept

the instruction (Status register bit WEL = 1). Once write is enabled, the WRID instruction is initiated by driving the

S pin low, then shifting the instruction code 82h followed by a 24-bit address (A23-A0) and at least one data byte,

into the D pin. The S pin must be held low for the whole length of the instruction, while data is being sent to the

device. The instruction is completed by driving S high (see Figure 28).

Figure 28. Write identification page

A23 A22 A21

4121

4122

4123

4124

4125

4126

4127

4128

24-bit address

WRID instruction

Data byte 1

Data byte 2

Data byte 512

MS69258V1

Each time a new data byte is shifted in, the least significant bits of the internal address counter are incremented.

If the address counter exceeds the page boundary (the page size is 512 bytes), the internal address pointer rolls

over to the beginning of the page where next data bytes are written. If more than 512 bytes are received, only the

last 512 bytes are written.

6.19

JEDEC identification (9Fh)

The JEDEC identification (JDID) instruction allows the three device identification bytes to be read in loop mode

(see Table 13).

This instruction is initiated by driving the S pin low, and then shifting the instruction code 9Fh into the D pin. The

code bits are latched on the rising edge of the C pin. After the last bit of instruction code is received, the three

identification bytes are shifted out (MSB first) on the Q pin, on the next falling clock edge. The same three bytes

are continuously shifted out as long as the clock continues to cycle. The instruction is stopped by driving the S pin

high, as shown in Figure 29.

Figure 29. JEDEC identification

High impedance

JDID instruction

ST manufacturer code

SPI family code

Memory density code

MS55490V1

M95P16-I M95P16-E

Write identification page (82h)

DS13710 - Rev 1

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