SST25VF080B datasheet(9/32 Pages) MICROCHIP

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DS20005045C-page 9

SST25VF080B

4.4.3

BYTE-PROGRAM

The Byte-Program instruction programs the bits in the

selected byte to the desired data. The selected byte

must be in the erased state (FFH) when initiating a Pro-

gram operation. A Byte-Program instruction applied to a

protected memory area will be ignored.

Prior to any Write operation, the Write-Enable (WREN)

instruction must be executed. CE# must remain active

low for the duration of the Byte-Program instruction.

The Byte-Program instruction is initiated by executing

an 8-bit command, 02H, followed by address bits [A23-

A0]. Following the address, the data is input in order

from MSB (bit 7) to LSB (bit 0). CE# must be driven

high before the instruction is executed. The user may

poll the Busy bit in the software status register or wait

TBP for the completion of the internal self-timed Byte-

Program operation. See Figure 4-5 for the Byte-Pro-

gram sequence.

FIGURE 4-5:

BYTE-PROGRAM SEQUENCE

4.4.4

AUTO ADDRESS INCREMENT (AAI)

WORD-PROGRAM

The AAI program instruction allows multiple bytes of

data to be programmed without re-issuing the next

sequential address location. This feature decreases

total programming time when multiple bytes or entire

memory array is to be programmed. An AAI Word pro-

gram instruction pointing to a protected memory area

will be ignored. The selected address range must be in

the erased state (FFH) when initiating an AAI Word

Program operation. While within AAI Word Program-

ming sequence, only the following instructions are

valid: for software end-of-write detection—AAI Word

(ADH), WRDI (04H), and RDSR (05H); for hardware

end-of-write detection—AAI Word (ADH) and WRDI

(04H). There are three options to determine the com-

pletion of each AAI Word program cycle: hardware

detection by reading the Serial Output, software detec-

tion by polling the BUSY bit in the software status reg-

ister, or wait TBP. Refer to“End-of-Write Detection” for

details.

Prior to any write operation, the Write-Enable (WREN)

instruction must be executed. Initiate the AAI Word

Program instruction by executing an 8-bit command,

ADH, followed by address bits [A23-A0]. Following the

addresses, two bytes of data are input sequentially,

each one from MSB (Bit 7) to LSB (Bit 0). The first byte

of data (D0) is programmed into the initial address [A23-

A1] with A0=0, the second byte of Data (D1) is pro-

grammed into the initial address [A23-A1] with A0=1.

CE# must be driven high before executing the AAI

Word Program instruction. Check the BUSY status

before entering the next valid command. Once the

device indicates it is no longer busy, data for the next

two sequential addresses may be programmed, fol-

lowed by the next two, and so on.

When programming the last desired word, or the high-

est unprotected memory address, check the busy sta-

tus using either the hardware or software (RDSR

instruction) method to check for program completion.

Once programming is complete, use the applicable

method to terminate AAI. If the device is in Software

End-of-Write Detection mode, execute the Write-Dis-

able (WRDI) instruction, 04H. If the device is in AAI

Hardware End-of-Write Detection mode, execute the

Write-Disable (WRDI) instruction, 04H, followed by the

8-bit DBSY command, 80H. There is no wrap mode

during AAI programming once the highest unprotected

memory address is reached. See Figures 4-8 and 4-9

for the AAI Word programming sequence.

4.4.5

END-OF-WRITE DETECTION

There are three methods to determine completion of a

program cycle during AAI Word programming: hard-

ware detection by reading the Serial Output, software

detection by polling the BUSY bit in the Software Status

detection method is described in the section below.

1296 ByteProg.0

CE#

SCK

ADD.

01 2 3 4 5 6 7 8

ADD.

DIN

HIGH IMPEDANCE

15 16

23 24

31 32

MODE 0

MODE 3

MSB

LSB

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