SAF-XC858CA-16FFI5V 데이터 시트보기 (PDF) - Infineon Technologies
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SAF-XC858CA-16FFI5V Datasheet PDF : 124 Pages
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XC858CA
Functional Description
Table 3
Flash Protection Modes (cont’d)
Flash
Without hardware
Protection protection
With hardware protection
P-Flash
program
and erase
Possible
Possible only on the Possible only on the
condition that MSB - 1 condition that MSB - 1
of password is set to 1 of password is set to 1
D-Flash
contents
can be read
by
Read instructions in
any program memory
Read instructions in Read instructions in
any program memory the P-Flash or D-
Flash
External
Not possible
access to D-
Flash
Not possible
Not possible
D-Flash
program
Possible
Possible
Possible, on the
condition that MSB - 1
of password is set to 1
D-Flash
erase
Possible
Possible, on these
Possible, on the
conditions:
condition that MSB - 1
• MISC_CON.DFLASH of password is set to 1
EN bit is set to 1
prior to each erase
operation; or
• the MSB - 1 of
password is set to 1
BSL mode 6, which is used for enabling Flash protection, can also be used for disabling
Flash protection. Here, the programmed password must be provided by the user. To
disable the flash protection, a password match is required. A password match triggers
an automatic erase of the protected P-Flash and D-Flash contents, including the
programmed password. With a valid password, the Flash hardware protection is then
enabled or disabled upon next reset. For the other protection strategies, no reset is
necessary.
Although no protection scheme can be considered infallible, the XC858 memory
protection strategy provides a very high level of protection for a general purpose
microcontroller.
Data Sheet
21
V1.0, 2010-03
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