ST6255C datasheet(80/84 Pages) STMICROELECTRONICS

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ST6255C ST6265C ST6265B

8.3 ROM DEVICES

The ST6255C and ST6265B are mask pro-

grammed ROM versions.

They offer the same functionality as OTP devices,

selecting as ROM options the options defined in

the programmable option byte of the OTP version,

except the LVD & OSG options that are not availa-

ble on the ST6265B ROM device.

Figure 54. Programming Waveform

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

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 gener-

ated 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 82.

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

STMicroelectronics. The signed listing forms a

part of the contractual agreement for the creation

of the specific customer mask.

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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