XC888LM datasheet(28/144 Pages) INFINEON

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XC886/888CLM

Functional Description

Data Sheet

V0.9, 2006-12

code or data. Therefore, even though the ROM device contains either a 24-Kbyte or 32-

Kbyte ROM, the maximum size of code that can be placed in the ROM is the given size

less four bytes.

3.2.1

Memory Protection Strategy

The XC886/888 memory protection strategy includes:

•

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

devices) and ROM (for ROM devices) memory from being read

– Flash protection is enabled by programming a valid password (8-bit non-zero

value) via BSL mode 6.

– ROM protection is fixed with the ROM mask and is always enabled.

•

Flash program and erase protection: This feature is available only for Flash devices.

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 4.

Table 4

Flash Protection Modes

Flash Protection Without hardware

protection

With hardware protection

Hardware

Protection Mode

-0

Activation

Program a valid password via BSL mode 6

Selection

Bit 4 of password = 0 Bit 4 of password = 1

MSB of password = 0

Bit 4 of password = 1

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 access

to P-Flash

Not possible

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