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Mode

CE

OE

WE

A0

A1

A6

A9

DQ0-DQ7

ID read MFR code

L

L

H

L

L

L

Code

ID read device code

L

L

H

H

L

L

Code

Read

L

L

H

Standby

H

XXX

XXX

High Z

Output disable

L

H

H

X

X

X

X

High Z

Write

L

H

L

A0

A1

A6

A9

Enable sector protect

L

Pulse/L

L

H

L

X

Sector unprotect

L

Pulse/L

L

X

Verify sector protect

L

L

H

L

H

L

Code

Item

Description

ID MFR code,

device code

Read mode

Standby

for CMOS levels. If activated during an automated on-chip algorithm, the device completes the operation

before entering standby.

Output disable Part remains powered up; but outputs disabled with OE pulled high.

Write

Selected with CE = WE = L, OE = H. Accomplish all Flash erasure and programming through the command

register. Contents of command register serve as inputs to the internal state machine. Address latching occurs

on the falling edge of WE or CE, whichever occurs late . Data latching occurs on the rising edge WE or CE,

whichever occurs first. Filters on WE prevent spurious noise events from appearing as write commands.

Enable

sector protect

Hardware protection circuitry implemented with external programming equipment causes the device to

disable program and erase operations for specified sectors.

Sector

unprotect

Disables sector protection for all sectors using external programming equipment. All sectors must be

protected prior to sector unprotection.

Verify

sector protect

Verifies write protection for sector. Sectors are protected from program/erase operations on commercial

programming equipment. Determine if sector protection exists in a system by writing the ID read command

sequence and reading location XXX02h, where address bits A16–18 select the defined sector addresses.

A logical 1 on DQ0 indicates a protected sector; a logical 0 indicates an unprotected sector.