Datasheet

32 Mbit SPI Serial Flash

SST25VF032B

Data Sheet

Microchip Technology Company

Chip-Erase

The Chip-Erase instruction clears all bits in the device to FFH. A Chip-Erase instruction will be ignored

if any of the memory area is protected. Prior to any Write operation, the Write-Enable (WREN) instruction

must be executed. CE# must remain active low for the duration of the Chip-Erase instruction sequence.

Initiate the Chip-Erase instruction by executing an 8-bit command, 60H or C7H. CE# must be driven high

before the instruction is executed. Poll the Busy bit in the software status register or wait T

for the comple-

tion of the internal self-timed Chip-Erase cycle. See Figure 15 for the Chip-Erase sequence.

Figure 15: Chip-Erase Sequence

Read-Status-Register (RDSR)

The Read-Status-Register (RDSR) instruction allows reading of the status register. The status register

may be read at any time even during a Write (Program/Erase) operation. When a Write operation is in

progress, the Busy bit may be checked before sending any new commands to assure that the new

commands are properly received by the device. CE# must be driven low before the RDSR instruction is

entered and remain low until the status data is read. Read-Status-Register is continuous with ongoing

clock cycles until it is terminated by a low to high transition of the CE#. See Figure 16 for the RDSR

instruction sequence.

Figure 16: Read-Status-Register (RDSR) Sequence

CE#

SCK

01234567

60 or C7

HIGH IMPEDANCE

MODE 0

MODE 3

1327 F16.0

MSB

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

1327 F17.0

MODE 3

SCK

CE#

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

MODE 0

HIGH IMPEDANCE

Status

MSB