SST25PF040C datasheet(16/47 Pages) MICROCHIP

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SST25PF040C

DS20005397F-page 16

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5.8

Chip Erase

The Chip Erase instruction clears all bits in the device

to FFH. A Chip Erase instruction is 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 exe-

cuted. Poll the BUSY bit in the software STATUS regis-

ter, or wait TSCE, for the completion of the internal self-

timed Chip Erase cycle. See Figure 5-8 for the Chip

Erase sequence and Figure 6-10 for the flow chart.

FIGURE 5-8:

CHIP ERASE SEQUENCE

5.9

Read STATUS Register (RDSR)

The Read STATUS Register (RDSR) instruction, 05H,

allows reading of the STATUS register. The STATUS

(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 tran-

sition of the CE#. See Figure 5-9 for the RDSR instruc-

tion sequence.

FIGURE 5-9:

READ STATUS REGISTER (RDSR) SEQUENCE

CE#

SCK

0 1 234 5 6 7

60 or C7

High-Impedance

MODE 0

MODE 3

MSb

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

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