saa-xc866 Infineon Technologies Corporation, saa-xc866 Datasheet - Page 20

• Manufacturer Part Number: saa-xc866
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Infineon Technologies Corporation

3.2.1
The SAA-XC866 memory protection strategy includes:
• Read-out protection: The Flash Memory can be enabled for read-out protection and
• Program and erase protection: The Flash memory in all devices can be enabled for
Flash memory protection is available in two modes:
• Mode 0: Only the P-Flash is protected; the D-Flash is unprotected
• Mode 1: Both the P-Flash and D-Flash are protected
The selection of each protection mode and the restrictions imposed are summarized in
Table
Table 3
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 read-protected Flash contents, see
Table 4
then disabled upon the next reset.
For XC866-2FR and XC866-4FR devices:
The selection of protection type is summarized in
Data Sheet
Mode
Activation
Selection
P-Flash contents
can be read by
P-Flash program
and erase
D-Flash contents
can be read by
D-Flash program Possible
D-Flash erase
ROM memory is always protected.
program and erase protection.
3.
and
Memory Protection Strategy
Table
Flash Protection Modes
5, and the programmed password is erased. The Flash protection is
0
Program a valid password via BSL mode 6
MSB of password = 0
Read instructions in the
P-Flash
Not possible
Read instructions in any program
memory
Possible, on the condition that bit
DFLASHEN in register MISC_CON
is set to 1 prior to each erase
operation
16
Table
4.
1
MSB of password = 1
Read instructions in the
P-Flash or D-Flash
Not possible
Read instructions in the
P-Flash or D-Flash
Not possible
Not possible
Functional Description
SAA-XC866
V1.2, 2008-02