AN1474 Datasheet, PDF (3/10 Pages) STMicroelectronics – ST92F150 AND ST92F120 PROBLEM RESOLUTION GUIDELINES

ST92F150 AND ST92F120 PROBLEM RESOLUTION GUIDELINES
2 ST92F120 RESET VECTOR
One of the powerful features provided by the ST9 Flash device family is the possibility to up-
grade the application code by downloading and programming through an I/O interface on the
MCU (refer to the application note AN1275 In Application Programming for the ST92F120 for
a detailled description).
In case of a parasitic reset during the flash upgrade operation, the application must be able to
recover safely by executing the bootloader code.
To perform this, the bootloader is present in the flash sector where the application starts, the
one pointed to by the reset vector. This sector must never be erased.
This is why the reset vector is always located in the smallest sector.
ST92F120 60Kbyte Flash device map
Sector
F0
F1
F2
Size
4 Kbyte
48 Kbyte
8 Kbyte
ST92F120 128Kbyte Flash device map
Sector
F0
F1
F2
F3
Size
64 Kbyte
48 Kbyte
8 Kbyte
8 Kbyte
ST92F150 60 Kbyte Flash device map
Sector
F0
F1
F2
F3
Size
8 Kbyte
8 Kbyte
32 Kbyte
12 Kbyte
ST92F150 128Kbyte Flash device map
Sector
F0
F1
F2
F3
Size
8 Kbyte
8 Kbyte
48 Kbyte
64 Kbyte
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