UPI-41AH Datasheet, PDF(6/20 Page) Intel Corporation – UNIVERSAL PERIPHERAL INTERFACE 8-BIT SLAVE MICROCONTROLLER

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UPI-41AH Datasheet, PDF (6/20 Pages) Intel Corporation – UNIVERSAL PERIPHERAL INTERFACE 8-BIT SLAVE MICROCONTROLLER

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UPI-41AH 42AH

210393 â 11

Figure 8 UPI-41AH 42AH 80-Column

Matrix Printer Interface

PROGRAMMING AND VERIFYING THE

8741AH AND 8742AH OTP EPROM

Programming Verification

In brief the programming process consists of acti-

vating the program mode applying an address

latching the address applying data and applying a

programming pulse Each word is programmed com-

pletely before moving on to the next and is followed

by a verification step The following is a list of the

pins used for programming and a description of their

functions

Function

XTAL 1 2 Clock Inputs

Reset Initialization and Address Latching

Test 0 Selection of Program or Verify Mode

Activation of Program Verify Signature

Row Security Bit Modes

BUS

Address and Data Input

Data Output During Verify

P20â22 Address Input

VDD

Programming Power Supply

PROG Program Pulse Input

WARNING

An attempt to program a missocketed 8741AH or 8742AH will result in

severe damage to the part An indication of a properly socketed part is

the appearance of the SYNC clock output The lack of this clock may

be used to disable the programmer

The Program Verify sequence is

1 CS e 5V VCC e 5V VDD e 5V RESET e 0V

A0 e 0V TEST 0 e 5V clock applied or internal

oscillator operating BUS floating PROG e 5V

2 Insert 8741AH or 8742AH in programming socket

3 TEST 0 e 0V (select program mode)

4 EA e 12 5V (active program mode)

5 VCC e 6V (programming supply)

6 VDD e 12 5V (programming power)

7 Address applied to BUS and P20â22

8 RESET e 5V (latch address)

9 Data applied to BUS

10 PROG e 5V followed by one 1 ms pulse to 0V

11 TEST 0 e 5V (verify mode)

12 Read and verify data on BUS

13 TEST 0 e 0V

14 Apply overprogram pulse

15 RESET e 0V and repeat from step 6

16 Programmer should be at conditions of step 1

when 8741AH or 8742AH is removed from socket

Please follow the inteligent Programming flow chart

for proper programming procedure

inteligent Programming Algorithm

The inteligent Programming Algorithm rapidly pro-

grams Intel 8741AH 8742AH EPROMs using an effi-

cient and reliable method particularly suited to the

production programming environment Typical pro-

gramming time for individual devices is on the order

of 10 seconds Programming reliability is also en-

sured as the incremental program margin of each

byte is continually monitored to determine when it

has been successfully programmed A flowchart of

the 8741AH 8742AH inteligent Programming Algo-

rithm is shown in Figure 9

The inteligent Programming Algorithm utilizes two

different pulse types initial and overprogram The

duration of the initial PROG pulse(s) is one millisec-

ond which will then be followed by a longer overpro-

gram pulse of length 3X msec X is an iteration coun-

ter and is equal to the number of the initial one milli-

second pulses applied to a particular 8741AH

8742AH location before a correct verify occurs Up

to 25 one-millisecond pulses per byte are provided

for before the overprogram pulse is applied

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