M25P05-AVMP6T datasheet(25/41 Pages) STMICROELECTRONICS

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M25P10-A

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 Electronic Signature,

whose value for the

M25P10-A is 10h.

Except while an Erase, Program or Write Status

Deep Power-down and Read Electronic Signature

(RES) instruction always provides access to the 8-

bit Electronic Signature of the device, and can be

applied 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.

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 19.

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 Standby Power mode. If the device was

not previously in the Deep Power-down mode, the

transition to the Standby Power mode is immedi-

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

er-down mode, though, the transition to the

Standby Power mode is delayed by tRES2, and

Chip Select (S) must remain High for at least

tRES2(max), as specified in Table 15. Once in the

Standby Power mode, the device waits to be se-

lected, so that it can receive, decode and execute

instructions.

Driving Chip Select (S) High after the 8-bit instruc-

tion byte has been received by the device, but be-

fore the whole of the 8-bit Electronic Signature has

been transmitted for the first time (as shown in Fig-

ure 20.), still ensures that the device is put into

Standby Power mode. If the device was not previ-

ously in the Deep Power-down mode, the transi-

tion to the Standby Power mode is immediate. If

the device was previously in the Deep Power-

down mode, though, the transition to the Standby

Power mode is delayed by tRES1, and Chip Select

(S) must remain High for at least tRES1(max), as

specified in Table 15. Once in the Standby Power

mode, the device waits to be selected, so that it

can receive, decode and execute instructions.

Figure 19. Release from Deep Power-down and Read Electronic Signature (RES) Instruction

Sequence and Data-Out Sequence

Note: The value of the 8-bit Electronic Signature, for the M25P10-A, is 10h.

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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