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ST10F280 Fiches technique(PDF) 49 Page - STMicroelectronics

No de pièce ST10F280
Description  16-bit MCU with MAC unit, 512 Kbyte Flash memory and 18 Kbyte RAM
PDF  239 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST10F280 Fiches technique(HTML) 49 Page - STMicroelectronics

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ST10F280
Internal Flash memory
Doc ID 8673 Rev. 3
49/239
Figure 6.
Hardware provisions to activate the BSL
Figure 7.
Memory configuration after reset
5.6.3
Loading the startup code
After sending the identification Byte the BSL enters a loop to receive 32 Bytes via ASC0.
These Byte are stored sequentially into locations 00’FA40h through 00’FA5Fh of the internal
RAM. So up to 16 instructions may be placed into the RAM area. To execute the loaded
code the BSL then jumps to location 00’FA40h, which is the first loaded instruction.
The bootstrap loading sequence is now terminated, the ST10F280 remains in BSL mode,
however. Most probably the initially loaded routine will load additional code or data, as an
average application is likely to require substantially more than 16 instructions. This second
receive loop may directly use the pre-initialized interface ASC0 to receive data and store it to
arbitrary user-defined locations.
This second level of loaded code may be the final application code. It may also be another,
more sophisticated, loader routine that adds a transmission protocol to enhance the integrity
16 MBytes
16 MBytes
16 MBytes
BSL mode active
Yes (P0L.4=’0’)
Yes (P0L.4=’0’)
No (P0L.4=’1’)
EA pin
High
Low
Access to application
Code fetch from
internal Flash area
Test-Flash access
Test-Flash access
User Flash access
Data fetch from
internal Flash area
User Flash access
User Flash access
User Flash access
IRAM
1
0
User
Flash
Test
Flash
Segment
2
255
Access to:
external
bus
disabled
internal
enabled
Flash
1
0
User
Flash
Test
Flash
Segment
2
255
Access to:
external
bus
enabled
internal
enabled
Flash
IRAM
1
0
User
Flash
Segment
2
255
Access:
depends on
reset config
EA, Port0
depends on
reset config
EA, Port0
IRAM



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