M25P64 datasheet(14/38 Pages) STMICROELECTRONICS

14 / 38 page

M25P64

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INSTRUCTIONS

All instructions, addresses and data are shifted in

and out of the device, most significant bit first.

Serial Data Input (D) is sampled on the first rising

edge of Serial Clock (C) after Chip Select (S) is

driven Low. Then, the one-byte instruction code

must be shifted in to the device, most significant bit

first, on Serial Data Input (D), each bit being

latched on the rising edges of Serial Clock (C).

The instruction set is listed in Table 4..

Every instruction sequence starts with a one-byte

instruction code. Depending on the instruction,

this might be followed by address bytes, or by data

bytes, or by both or none.

In the case of a Read Data Bytes (READ), Read

Data Bytes at Higher Speed (Fast_Read), Read

Status Register (RDSR), Read Identification

(RDID) or Read Electronic Signature (RES) in-

struction, the shifted-in instruction sequence is fol-

lowed by a data-out sequence. Chip Select (S) can

be driven High after any bit of the data-out se-

quence is being shifted out.

In the case of a Page Program (PP), Sector Erase

(SE), Bulk Erase (BE), Write Status Register

(WRSR), Write Enable (WREN) or Write Disable

(WRDI), Chip Select (S) must be driven High ex-

actly at a byte boundary, otherwise the instruction

is rejected, and is not executed. That is, Chip Se-

lect (S) must driven High when the number of

clock pulses after Chip Select (S) being driven

Low is an exact multiple of eight.

All attempts to access the memory array during a

Write Status Register cycle, Program cycle or

Erase cycle are ignored, and the internal Write

Status Register cycle, Program cycle or Erase cy-

cle continues unaffected.

Table 4. Instruction Set

Instruction

Description

One-byte Instruction Code

Address

Bytes

Dummy

Bytes

Data

Bytes

WREN

Write Enable

0000 0110

06h

WRDI

Write Disable

0000 0100

04h

RDID

Read Identification

1001 1111

9Fh

1 to 3

RDSR

Read Status Register

0000 0101

05h

1 to

∞

WRSR

Write Status Register

0000 0001

01h

READ

Read Data Bytes

0000 0011

03h

1 to

∞

FAST_READ

Read Data Bytes at Higher Speed

0000 1011

0Bh

1 to

∞

Page Program

0000 0010

02h

1 to 256

Sector Erase

1101 1000

D8h

Bulk Erase

1100 0111

C7h

RES

Read Electronic Signature

1010 1011

ABh

1 to

∞

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