AT89C5132-ROTIL datasheet(18/181 Pages) ATMEL

18 / 181 page

4173D–USB–02/06

AT89C5132

7.1.1

User Space

This space is composed of a 64K Bytes Flash memory organized in 512 pages of 128 Bytes. It

contains the user’s application code. This space can be read or written by both software and

hardware modes.

7.1.2

Boot Space

This space is composed of a 4K Bytes Flash memory. It contains the bootloader for In-System

Programming and the routines for In-System Application Programming.

This space can only be read or written by hardware mode using a parallel programming tool.

7.1.3

Hardware Security Space

This space is composed of one byte: the Hardware Security Byte (HSB see Table 7) divided in

two separate nibbles see Table 7. The MSN contains the X2 mode configuration bit and the Boot

Loader Jump Bit as detailed in section “Boot Memory Execution” and can be written by software

while the LSN contains the lock system level to protect the memory content against piracy as

detailed in section “Hardware Security System” and can only be written by hardware.

7.1.4

Extra Row Space

This space is composed of two Bytes:

•

The Software Boot Vector (SBV see Table 8).

This byte is used by the software bootloader to build the boot address.

•

The Software Security Byte (SSB see Figure ).

This byte is used to lock the execution of some bootloader commands.

7.2

Hardware Security System

The AT89C5132 implements three lock Bits LB2:0 in the LSN of HSB (see Table 7) providing

three levels of security for user’s program as described in Table 7 while the AT83C51SND1C is

always set in read disabled mode.

•

Level 0 is the level of an erased part and does not enable any security feature.

•

Level 1 locks the hardware programming of both user and boot memories.

•

Level 2 locks hardware verifying of both user and boot memories.

•

Level 3 locks the external execution.

Notes:

1. U means unprogrammed, P means programmed and X means don’t care (programmed or

unprogrammed).

2. LB2 is not implemented in the AT89C5132 products.

3. AT89C5132 products are delivered with third level programmed to ensure that the code pro-

grammed by software using ISP or user’s bootloader is secured from any hardware piracy.

Table 5. Lock Bit Features

(1)

Level

LB2(2)

LB1

LB0

Internal

Execution

External

Execution

Hardware

Verifying

Hardware

Programming

Software

Programming

Enable

Disable

Enable

Disable

Enable

3(3)

Enable

Disable

Enable

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