saf-xc888cm-8ffi5v Infineon Technologies Corporation, saf-xc888cm-8ffi5v Datasheet - Page 29

• Manufacturer Part Number: saf-xc888cm-8ffi5v
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Infineon Technologies Corporation

Table 4
Flash Protection Without hardware
P-Flash program
and erase
D-Flash
contents can be
read by
External access
to D-Flash
D-Flash
program
D-Flash erase
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. A
password match triggers an automatic erase of the protected P-Flash and D-Flash
contents, including the programmed password. The Flash protection is then disabled
upon the next reset.
For the ROM device, the ROM is protected at all times and BSL mode 6 is used only to
block external access to the device. However, unlike the Flash device, it is not possible
to disable the memory protection of the ROM device. Here, entering BSL mode 6 will
result in a protection error.
Note: If ROM read-out protection is enabled, only read instructions in the ROM memory
Although no protection scheme can be considered infallible, the XC886/888 memory
protection strategy provides a very high level of protection for a general purpose
microcontroller.
Data Sheet
can target the ROM contents.
Flash Protection Modes (cont’d)
protection
Possible
Read instructions in
any program memory
Not possible
Possible
Possible
With hardware protection
Not possible
Read instructions in
any program memory
Not possible
Possible
Possible, on
condition that bit
DFLASHEN in
register MISC_CON
is set to 1 prior to
each erase operation
22
Functional Description
Not possible
Read instructions in
the P-Flash or D-
Flash
Not possible
Not possible
Not possible
XC886/888CLM
V1.1, 2009-01