SAF-XC858CA-16FFI5V 查看數據表（PDF） - Infineon Technologies

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SAF-XC858CA-16FFI5V

8-Bit Single-Chip Microcontroller

Infineon Technologies 

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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