ST7LITE25F2 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
ST7LITE25F2
STMicroelectronics
'ST7LITE25F2' PDF : 170 Pages View PDF
Flash program memory
ST7LITE20F2 ST7LITE25F2 ST7LITE29F2
Caution:
During normal operation the ICCCLK pin must be pulled up, internally or externally (external
pull-up of 10k mandatory in noisy environment). This is to avoid entering ICC mode
unexpectedly during a reset. In the application, even if the pin is configured as output, any
reset will put it back in input pull-up.
Figure 5. Typical ICC interface
Optional
Programming tool
ICC connector
ICC Cable
ICC connector
HE10 connector type
9 7 5 31
10 8 6 4 2
Application board
Application
reset source
Application
power supply
Application
I/O
ST7
4.5
Memory protection
There are two different types of memory protection: Read-Out Protection and Write/Erase
Protection which can be applied individually.
4.5.1
Read-out protection
Read-out protection, when selected provides a protection against program memory content
extraction and against write access to Flash memory. Even if no protection can be
considered as totally unbreakable, the feature provides a very high level of protection for a
general purpose microcontroller. Both program and data E2 memory are protected.
In flash devices, this protection is removed by reprogramming the option. In this case, both
program and data E2 memory are automatically erased and the device can be
reprogrammed.
Read-out protection selection depends on the device type:
● In Flash devices it is enabled and removed through the FMP_R bit in the option byte.
● In ROM devices it is enabled by mask option specified in the Option List.
4.5.2
Caution:
Flash write/erase protection
Write/erase protection, when set, makes it impossible to both overwrite and erase program
memory. It does not apply to E2 data. Its purpose is to provide advanced security to
applications and prevent any change being made to the memory content.
Once set, Write/erase protection can never be removed. A write-protected flash device is no
longer reprogrammable.
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Doc ID 8349 Rev 5
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