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M25P10-A Datasheet(PDF) 25 Page - STMicroelectronics

Part No. M25P10-A
Description  1 Mbit, Low Voltage, Serial Flash Memory With 25 MHz SPI Bus Interface
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M25P10-A Datasheet(HTML) 25 Page - 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
Register cycle is in progress, the Release from
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.
C
D
AI04047C
S
Q
23
2
1
3456789 10
28 29 30 31 32 33 34 35
22 21
3210
36 37 38
765432
0
1
High Impedance
Electronic Signature Out
Instruction
3 Dummy Bytes
0
MSB
Stand-by Mode
Deep Power-down Mode
MSB
tRES2


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