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

3.2.1 Memory Protection Strategy

The XC858 memory protection strategy includes:

• Basic protection: The user is able to block any external access via the boot option to

any memory

• Read-out protection: The user is able to protect the contents in the Flash

• Flash program and erase protection

These protection strategies are enabled by programming a valid password (16-bit non-

one value) via Bootstrap Loader (BSL) mode 6.

3.2.1.1 Flash Memory Protection

As long as a valid password is available, all external access to the device, including the

Flash, will be blocked.

For additional security, the Flash hardware protection can be enabled to implement a

second layer of read-out protection, as well as to enable program and erase protection.

Flash hardware protection is available only for Flash devices and comes 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 3.

Table 3

Flash Protection Modes

Flash

Without hardware

Protection protection

With hardware protection

Hardware -

Protection

Mode

0

1

Activation Program a valid password via BSL mode 6

Selection

Bit 13 of password = 0 Bit 13 of password = 1 Bit 13 of password = 1

MSB of password = 0 MSB of password = 1

P-Flash

contents

can be read

by

Read instructions in

any program memory

Read instructions in

the P-Flash

Read instructions in

the P-Flash or D-

Flash

External

Not possible

access to P-

Flash

Not possible

Not possible

Data Sheet

20

V1.0, 2010-03

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