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P. 3 of 29

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ID.

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Mode

CE

OE

WE

A0

A1

A6

A9

RESET

DQ

ID read MFR code

LL

H

LLL

HCode

ID read device code

L

L

H

H

L

L

HCode

Read

L

L

H

A0A1

A6A9

H

Standby

H

XXXXXX

H

High Z

Output disable

L

H

H

XXXX

H

High Z

Write

L

H

L

A0

A1

A6

A9

H

Enable sector protect

L

Pulse/L

L

H

L

HX

Sector unprotect

L

Pulse/L

L

H

H

HX

Temporary sector

unprotect

XXXXXXX

X

L

L

HLHL

HCode

Verify sector unprotect

†

LL

H

L

H

H

HCode

Hardware Reset

XXXXXXX

L

High Z

Item

Description

ID MFR code,

device code

Read mode

Standby

activated during an automated on-chip algorithm, the device completes the operation before entering

standby.

Output disable

Part remains powered up; but outputs tri-stated 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 later. 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. For in-system sector protection, refer to Sector

protect algorithm on page 15.

Sector unprotect

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

protected prior to sector unprotection. For in-system sector unprotection, refer to Sector unprotect

algorithm on page 15.