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As one of the most procedures of ST ST62T10 Embedded Code Unlocking, EPROM/OTP programming mode is set by a +12.5V voltage applied to the TEST/VPP pin. The programming flow  of  the  ST62T00C, T01/E01C and T03C is described in the User Manual of the EPROM Programming Board.

ST ST62T10 Embedded Code Unlocking

The EPROM devices can be erased by exposure to Ultra Violet light. The characteristics of the MCU are such that erasure begins when the memory is exposed to light with a wave lengths shorter than approximately 4000Å.

It should be noted that sunlight and some types of fluorescent lamps have wavelengths in the range 3000-4000Å.

ST62T10 Program memory map

It is thus recommended that the window of the MCU packages be covered by an opaque label to prevent unintentional erasure problems when testing the application in such an environment.

The recommended erasure procedure is exposure to short wave ultraviolet light which have a wave- length 2537Å. The integrated dose (i.e. U.V. intensity x exposure time) for erasure should be a minimum of 30W-sec/cm2. The erasure time with this dosage is approximately 30 to 40 minutes using an ultraviolet lamp with 12000µW/cm2 power rating. The EPROM device should be placed within 2.5cm (1inch) of the lamp tubes during erasure.