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
tRES2
Instruction
3 Dummy Bytes
23 22 21
MSB
3
2
1
0
D
Q
Electronic Signature Out
High Impedance
7
6
5
4
3
2
0
1
MSB
Deep Power-down Mode
Stand-by Mode
AI04047C
1. The value of the 8-bit Electronic Signature, for the M25P20, is 11h.
Figure 19. Release from Deep Power-down (RES) Instruction Sequence
S
tRES1
0
1
2
3
4
5
6
7
C
D
Instruction
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 t
, and Chip Select (S)
RES1
must remain High for at least t
(max), as specified in Table 18. Once in the Standby
RES1
Power mode, the device waits to be selected, so that it can receive, decode and execute
instructions.
32/50
NUMONYX [ NUMONYX B.V ]
