SST25PF040C datasheet(14/47 Pages) MICROCHIP

14 / 47 page

SST25PF040C

DS20005397F-page 14

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5.5

Page Program

The Page Program instruction programs up to

256 bytes of data in the memory. The data for the

selected page address must be in the erased state

(FFH) before initiating the Page-Program operation. A

Page Program applied to a protected memory area will

be ignored. Prior to the program operation, execute the

WREN instruction.

To execute a Page Program operation, the host drives

CE# low, then sends the Page Program command

cycle (02H), three address cycles, followed by the data

to be programmed, and then drives CE# high. The pro-

grammed data must be between 1 to 256 bytes and in

whole byte increments; sending less than a full byte will

cause the partial byte to be ignored. Poll the BUSY bit

in the STATUS register, or wait TPP, for the completion

of the internal, self-timed, Page Program operation.

See Figure 5-5 for the Page Program sequence and

Figure 6-8 for the Page Program flow chart.

When executing Page Program, the memory range for

the SST25PF040C is divided into 256-byte page

boundaries. The device handles the shifting of more

than 256 bytes of data by maintaining the last

256 bytes as the correct data to be programmed. If the

target address for the Page Program instruction is not

the beginning of the page boundary (A[7:0] are not all

zero), and the number of bytes of data input exceeds or

overlaps the end of the address of the page boundary,

the excess data inputs wrap around and will be pro-

grammed at the start of that target page.

FIGURE 5-5:

PAGE PROGRAM SEQUENCE

CE#

SCK

ADD.

0 1 234 5 6 78

ADD.

Data Byte 0

High-Impedance

15 16

23 24

31 32

MODE 0

MODE 3

MSb

LSb

CE#(cont’)

SO(cont’)

SI(cont’)

SCK(cont’)

40 41 42 43 44 45 46

47 48

Data Byte 1

High-Impedance

MSb

LSb

50 51 52 53 54 55

Data Byte 2

Data Byte 255

LSb

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