M45PE80 datasheet(29/47 Pages) STMICROELECTRONICS

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M45PE80

Instructions

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6.11

Deep Power-down (DP)

Executing the Deep Power-down (DP) instruction is the only way to put the device in the

lowest consumption mode (the Deep Power-down mode). It can also be used as an extra

software protection mechanism, while the device is not in active use, since in this mode, the

device ignores all Write, Program and Erase instructions.

Driving Chip Select (S) High deselects the device, and puts the device in the Standby mode

(if there is no internal cycle currently in progress). But this mode is not the Deep Power-

down mode. The Deep Power-down mode can only be entered by executing the Deep

Power-down (DP) instruction, to reduce the standby current (from ICC1 to ICC2, as specified

in Table 11).

To exit from Deep Power-down mode, the Release from Deep Power-down (RDP)

instruction must be issued. No other instruction must be issued while

the device is in this mode.

The Deep Power-down mode automatically stops at Power-down, and the device always

Powers-up in the Standby mode.

The Deep Power-down (DP) instruction is entered by driving Chip Select (S) Low, followed

by the instruction code on Serial Data Input (D). Chip Select (S) must be driven Low for the

entire duration of the sequence.

The instruction sequence is shown in Figure 16.

Chip Select (S) must be driven High after the eighth bit of the instruction code has been

latched in, otherwise the Deep Power-down (DP) instruction is not executed. As soon as

Chip Select (S) is driven High, it requires a delay of tDP before the supply current is reduced

to ICC2 and the Deep Power-down mode is entered.

Any Deep Power-down (DP) instruction, while an Erase, Program or Write cycle is in

progress, is rejected without having any effects on the cycle that is in progress.

Figure 16.

Deep Power-down (DP) instruction sequence

AI03753D

34567

tDP

Deep Power-down Mode

Stand-by Mode

Instruction

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