©2014 Silicon Storage Technology, Inc.

DS20005016C

11/14

15

512 Kbit / 1 Mbit / 2 Mbit / 4 Mbit 1.8V SPI Serial Flash

SST25WF512 / SST25WF010 / SST25WF020 / SST25WF040

EOL Data Sheet

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 Program 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

input in order from MSB (bit 7) to LSB (bit 0). CE# must be driven high before the instruction is exe-

the internal self-timed Byte-Program operation. See Figure 8 for the Byte-Program sequence.

Figure 8: Byte-Program Sequence

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 the entire memory array is to be programmed. An AAI Word program instruction pointing to a pro-

tected 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 Programming sequence, the

only valid instructions are AAI Word (ADH), RDSR (05H), or WRDI (04H). Users have three options to

determine the completion of each AAI Word program cycle: hardware detection by reading the Serial

End-Of-Write Detection section for details.

Prior to any write operation, the Write-Enable (WREN) instruction must be executed. The AAI Word

Following the addresses, two bytes of data are input sequentially, each one from MSB (Bit 7) to LSB

driven high before the AAI Word Program instruction is executed. The user must check the BUSY sta-

tus 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 and so on. When the last desired byte had been

entered, check the busy status using the hardware method or the RDSR instruction and execute the

Write-Disable (WRDI) instruction, 04H, to terminate AAI. Check the busy status after WRDI to deter-

mine if the device is ready for any command. See Figures 11 and 12 for AAI Word programming

sequence.

1328 F08.0

CE#

SO

SI

SCK

ADD.

012

34

5

6

7

8

ADD.

ADD.

02

HIGH IMPEDANCE

15 16

23 24

31 32

39

MSB

LSB

MODE 3

MODE 0

MSB