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M39432

Figure 6. EEPROM SDP-Enable Flowcharts

AI01698C

Write AAh in

Address 5555h

Write 55h in

Address 2AAAh

Write A0h in

Address 5555h

SDP is set

Write AAh in

Address 5555h

Write 55h in

Address 2AAAh

Write A0h in

Address 5555h

Write Data to

be Written in

any Address

SDP ENABLE ALGORITHM

Page Write

Timing

Page Write

Timing

Write

is enabled

SDP

Set

SDP

not Set

Write

in Memory

Write Data

and

SDP Set

after tWC

Table 7. Summary of the Use of Status Bits

Note: 1. If all the sectors to be erased are protected, DQ7 is reset to 0 for about 100

µs, then returns to the state it was in for the previously

addressed byte. No erasure is performed.

2. If all the sectors to be erased are protected, DQ6 is reset to 0 for about 100

µs, then returns to the state it was in for the previously

addressed byte. No erasure is performed.

Operation

Address

DQ7 (Data

Polling Bit)

DQ6 (Toggle Bit)

DQ5 (Program

Error Bit)

DQ3 (Erase

Time-Out Bit)

Program (Flash)

or

Erase (EEPROM)

Any address

DQ7

Toggling

0

X

Program Error

(Flash)

Any address in

the Flash block

DQ7

Toggling

1

X

Flash Block Erase

Any address in

the Flash block

01

Sector Erase

Sector address to

be erased

01

Sector Erase

before Time-Out

Sector address to

be erased

00

Erase Suspend

Any byte in the

sector in erase

mode

Invalid data on DQ7-DQ0

Other sector

addresses

DQ6 toggles for 15

µs, then behaves as for a standard Read operaion

Erase Error

Sector address

11