M25P20-VMN6TP_X 데이터 시트보기 (PDF) - STMicroelectronics

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M25P20-VMN6TP_X

2 Mbit, low voltage, Serial Flash memory with 50MHz SPI bus interface

STMicroelectronics 

Instructions

M25P20

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

Sequence and Data-Out Sequence

S

0 1 2 3 4 5 6 7 8 9 10 28 29 30 31 32 33 34 35 36 37 38

C

Instruction

3 Dummy Bytes

tRES2

D

23 22 21

3210

MSB

High Impedance

Q

Electronic Signature Out

76543210

MSB

Deep Power-down Mode

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

Figure 19. Release from Deep Power-down (RES) Instruction Sequence

Stand-by Mode

AI04047C

S

01234567

tRES1

C

Instruction

D

High Impedance

Q

Deep Power-down Mode Stand-by Mode

AI04078B

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.

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