ST6253C datasheet(79/83 Pages) STMICROELECTRONICS

79 / 83 page

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ST6253C ST6263C ST6263B ST6260C ST6260B

Figure 54. Programming wave form

8.3.1 ROM READOUT PROTECTION

If the ROM READOUT PROTECTION option is

selected, a protection fuse can be blown to pre-

vent any access to the program memory content.

In case the user wants to blow this fuse, high volt-

age must be applied on the TEST pin.

Figure 55. Programming Circuit

Note: ZPD15 is used for overvoltage protection

The following section deals with the procedure for

transfer of customer codes to STMicroelectronics.

8.3.2 Transfer of Customer Code

Customer code is made up of the ROM contents

and the list of the selected mask options. The ROM

contents are to be sent on diskette, or by electronic

means, with the hexadecimal file generated by the

development tool. All unused bytes must be set to

FFh.

The selected mask options are communicated to

STMicroelectronics using the correctly filled OP-

TION LIST appended. See page 81.

8.3.3 Listing Generation and Verification

When STMicroelectronics receives the user’s ROM

contents, a computer listing is generated from it.

This listing refers exactly to the mask which will be

used to produce the specified MCU. The listing is

then returned to the customer who must thoroughly

check, complete, sign and return it to STMicroelec-

tronics. The signed listing forms a part of the con-

tractual agreement for the creation of the specific

customer mask.

The STMicroelectronics Sales Organization will be

pleased to provide detailed information on con-

tractual points.

0.5s min

TEST

14V typ

TEST

100mA

4mA typ

VR02001

max

150 µs typ

VR02003

TEST

100nF

47mF

PROTECT

100nF

VDD

VSS

ZPD15

15V

14V

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