ST6373 datasheet(15/64 Pages) STMICROELECTRONICS

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ST6373

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1.4 MEMORY PROGRAMMING

1.4.1 Program Memory

The ST6373 OTP and EPROM MCUs can be pro-

grammed with a range of EPROM programming

tools available from SGS-THOMSON.

EPROM/OTP programming mode is set by a

+12.5V voltage applied to the TEST/VPP pin. The

programming flow is described in the User Manual

of the EPROM Programming Tool.

1.4.2 Option Byte

The Option Byte allows OTP and EPROM ver-

sions to be configured to offer the same features

available as mask options in ROM devices. The

Option Byte’s content is automatically read, and

the selected options enabled on Reset.

The Option Byte can only be accessed during pro-

gramming mode. Access is either automatic (copy

from a master device) or by selecting the OPTION

BYTE PROGRAMMING mode of the programmer.

The option byte is located in a non-user map. No

address needs to be specified.

Option Byte

bit 3 =

I2C Clock Speed:

0 = 100KHz (default)

1 = 400KHz

All other bits must be programmed as shown in the

The Option byte is written during programming ei-

ther by using the PC menu (PC driven Mode) or

automatically (stand-alone mode).

1.4.3 Eprom Erasure

Thanks to the transparent window present in the

EPROM package, its memory contents may be

erased by exposure to UV light.

Erasure begins when the device is exposed to light

with a wavelength shorter than 4000Å. It should be

noted that sunlight, as well as some types of artifi-

cial light, includes wavelengths in the 3000-4000Å

range which, on prolonged exposure, can cause

erasure of memory contents. It is thus recom-

mended that EPROM devices be fitted with an

opaque label over the window area in order to pre-

vent unintentional erasure.

The recommended erasure procedure for EPROM

devices consists of exposure to short wave UV

light having a wavelength of 2537Å. The minimum

recommended integrated dose (intensity x expo-

sure time) for complete erasure is 15Wsec/cm

This is equivalent to an erasure time of 15-20 min-

utes using a UV source having an intensity of

12mW/cm2 at a distance of 25mm (1 inch) from

the device window.

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