28F020

E

14

Start

Apply V

PPH

(1)

PLSCNT = 0

Write Set-Up

Program Cmd

Write Program

Verify Cmd

Read Data

from Device

Write Read Cmd

Verify

Data

Inc

PLSCNT

=25?

Last

Address?

Programming

Completed

Program

Error

Write Program

Cmd (A/D)

Time Out 10 µs

Apply V

PPL

(1)

Apply V

PPL

(1)

Time Out 6 µs

Increment

Address

N

Bus

Operation

Command

Comments

Initialize Pulse-Count

Write

Set-Up

Program

Data = 40H

Write

Program

Valid Address/Data

Standby

Duration of Program

Operation (t

Write

Program

Data = C0H; Stops

Stand-by

t

WHGL

Read

Read Byte to Verify

Programming

Standby

Wait for V

V

PPH

(1)

Standby

Compare Data Output to

Data Expected

Standby

Wait for V

(1)

Write

Read

Data = 00H, Resets the

Register for Read

Operations

Y

N

Y

Y

N

0245_04

NOTES:

1.

See

2.

Program Verify is performed only after byte programming. A final read/compare may be performed (optional) after the

register is written with the Read command.

3.

Refer of

Principles of Operation.

4.

Caution: The algorithm must be followed to ensure proper and reliable operation of the device.

Figure 4. 28F020 Quick-Pulse Programming Algorithm