CD00001237 Datasheet, PDF (15/105 Pages) STMicroelectronics – 8-bit MCUs with A/D converter

ST6215C ST6225C
3.2 PROGRAMMING MODES
3.2.1 Program Memory
EPROM/OTP programming mode is set by a
+12.5V voltage applied to the TEST/V_PP pin. The
programming flow of the ST62T15C,T25C/E25C is
described in the User Manual of the EPROM Pro-
gramming Board.
Table 3. ST6215C Program Memory Map
Device Address
0000h-087Fh
0880h-0F9Fh
0FA0h-0FEFh
0FF0h-0FF7h
0FF8h-0FFBh
0FFCh-0FFDh
0FFEh-0FFFh
Description
Reserved
User ROM
Reserved
Interrupt Vectors
Reserved
NMI Interrupt Vector
Reset Vector
Table 4. ST6225C Program Memory Map
Device Address
0000h-007Fh
0080h-0F9Fh
0FA0h-0FEFh
0FF0h-0FF7h
0FF8h-0FFBh
0FFCh-0FFDh
0FFEh-0FFFh
Description
Reserved
User ROM
Reserved
Interrupt Vectors
Reserved
NMI Interrupt Vector
Reset Vector
Note: OTP/EPROM devices can be programmed
with the development tools available from
STMicroelectronics (please refer to Section 13 on
page 100).
3.2.2 EPROM Erasing
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 sun-
light and some types of fluorescent lamps have
wavelengths in the range 3000-4000Å.
It is thus recommended that the window of the
MCU packages be covered by an opaque label to
prevent unintentional erasure problems when test-
ing 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. inten-
sity x exposure time) for erasure should be a mini-
mum 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.
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