M25P20 datasheet(32/50 Pages) STMICROELECTRONICS

32 / 50 page

Instructions

M25P20

32/50

Figure 18.

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

Sequence and Data-Out Sequence

The value of the 8-bit Electronic Signature, for the M25P20, is 11h.

Figure 19.

Release from Deep Power-down (RES) Instruction Sequence

Driving Chip Select (S) High after the 8-bit instruction byte has been received by the device,

but before the whole of the 8-bit Electronic Signature has been transmitted for the first time

(as shown in Figure 19), still ensures that the device is put into Standby Power mode. If the

device was not previously in the Deep Power-down mode, the transition 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 18. Once in the Standby

Power mode, the device waits to be selected, so that it can receive, decode and execute

instructions.

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

AI04078B

34567

tRES1

Stand-by Mode

Deep Power-down Mode

High Impedance

Instruction

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