M25P05-AVMP6T datasheet(20/34 Pages) STMICROELECTRONICS

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M25P05-A

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Figure 18. Release from Deep Power-down and Read Electronic Signature (RES) Instruction

Sequence and Data-Out Sequence

Release from Deep Power-down and Read

Electronic Signature (RES)

Once the device has entered the Deep Power-

down mode, all instructions are ignored except the

Release from Deep Power-down and Read Elec-

tronic Signature (RES) instruction. Executing this

instruction takes the device out of the Deep Pow-

er-down mode. The instruction can also be used to

read, on Serial Data Output (Q), the 8-bit Electron-

ic Signature of the device.

Except while an Erase, Program or Write Status

Deep Power-down and Read Electronic Signature

(RES) instruction always provides access to the

Electronic Signature of the device, and can be ap-

plied even if the Deep Power-down mode has not

been entered.

Any Release from Deep Power-down and Read

Electronic Signature (RES) instruction while an

Erase, Program or Write Status Register cycle is in

progress, is not decoded, and has no effect on the

cycle that is in progress.

This instruction serves a second purpose. The de-

vice features an 8-bit Electronic Signature, whose

value for the M25P05-A is 05h. This can be read

using the Release from Deep Power-down and

Read Electronic Signature (RES) instruction.

The device is first selected by driving Chip Select

(S) Low. The instruction code is followed by 3

dummy bytes, each bit being latched-in on Serial

Data Input (D) during the rising edge of Serial

Clock (C). Then, the 8-bit Electronic Signature,

stored in the memory, is shifted out on Serial Data

Output (Q), each bit being shifted out during the

falling edge of Serial Clock (C).

The instruction sequence is shown in Figure 18.

The Release from Deep Power-down and Read

Electronic Signature (RES) instruction is terminat-

ed by driving Chip Select (S) High after the Elec-

tronic Signature has been read at least once.

Sending additional clock cycles on Serial Clock

(C), while Chip Select (S) is driven Low, cause the

Electronic Signature to be output repeatedly.

When Chip Select (S) is driven High, the device is

put in the Stand-by Power mode. If the device was

not previously in the Deep Power-down mode, the

transition to the Stand-by Power mode is immedi-

ate. If the device was previously in the Deep Pow-

er-down mode, though, the transition to the Stand-

by Power mode is delayed by tRES2, and Chip Se-

lect (S) must remain High for at least tRES2(max),

as specified in Table 13. Once in the Stand-by

Power mode, the device waits to be selected, so

that it can receive, decode and execute instruc-

tions.

AI04047C

3456789 10

28 29 30 31 32 33 34 35

22 21

3210

36 37 38

765432

High Impedance

Electronic Signature Out

Instruction

3 Dummy Bytes

MSB

Stand-by Mode

Deep Power-down Mode

MSB

tRES2

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