M25P16 datasheet(21/39 Pages) STMICROELECTRONICS

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M25P16

Page Program (PP)

The Page Program (PP) instruction allows bytes to

be programmed in the memory (changing bits from

1 to 0). Before it can be accepted, a Write Enable

(WREN) instruction must previously have been ex-

ecuted. After the Write Enable (WREN) instruction

has been decoded, the device sets the Write En-

able Latch (WEL).

The Page Program (PP) instruction is entered by

driving Chip Select (S) Low, followed by the in-

struction code, three address bytes and at least

one data byte on Serial Data Input (D). If the 8

least significant address bits (A7-A0) are not all

zero, all transmitted data that goes beyond the end

of the current page are programmed from the start

address of the same page (from the address

whose 8 least significant bits (A7-A0) are all zero).

Chip Select (S) must be driven Low for the entire

duration of the sequence.

The instruction sequence is shown in Figure 16..

If more than 256 bytes are sent to the device, pre-

viously latched data are discarded and the last 256

data bytes are guaranteed to be programmed cor-

rectly within the same page. If less than 256 Data

bytes are sent to device, they are correctly pro-

grammed at the requested addresses without hav-

ing any effects on the other bytes of the same

page.

Chip Select (S) must be driven High after the

eighth bit of the last data byte has been latched in,

otherwise the Page Program (PP) instruction is not

executed.

As soon as Chip Select (S) is driven High, the self-

timed Page Program cycle (whose duration is tPP)

is initiated. While the Page Program cycle is in

progress, the Status Register may be read to

check the value of the Write In Progress (WIP) bit.

The Write In Progress (WIP) bit is 1 during the self-

timed Page Program cycle, and is 0 when it is

completed. At some unspecified time before the

cycle is completed, the Write Enable Latch (WEL)

bit is reset.

A Page Program (PP) instruction applied to a page

which is protected by the Block Protect (BP2, BP1,

BP0) bits (see Table 2. and Table 3.) is not execut-

ed.

Figure 16. Page Program (PP) Instruction Sequence

Note: Address bits A23 to A21 are Don’t Care.

AI04082B

43 44 45 46 47 48 49 50

52 53 54 55

3456789 10

28 29 30 31 32 33 34 35

22 21

3210

36 37 38

Instruction

24-Bit Address

765432

Data Byte 1

765432

Data Byte 2

765432

Data Byte 3

Data Byte 256

765432

MSB

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