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T89C51CC01_06 Datasheet(Hoja de datos) 4 Page - ATMEL Corporation

No. de Pieza. T89C51CC01_06
Descripción  CAN Microcontrollers
Descarga  32 Pages
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Fabricante  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
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4
T89C51CC01 CAN Bootloader
4210D–CAN–05/06
Mapping and Default Value of
Hardware Security Byte
The 4 Most Significant Byte (MSB) of the Hardware Byte can be read/written by soft-
ware (this area is called Fuse bits). The 4 (Least Significant Byte) LSB can only be read
by software and written by hardware in parallel mode (with parallel programmer
devices).
Note:
1. U: Unprogram = 1
P: Program = 0
Security
The bootloader has Software Security Byte (SSB) to protect itself from user access or
ISP access.
The Software Security Byte (SSB) protects from ISP accesses. The command ‘Program
Software Security Bit’ can only write a higher priority level. There are three levels of
security:
Level 0: NO_SECURITY (FFh)
This is the default level.
From level 0, one can write level 1 or level 2.
Level 1: WRITE_SECURITY (FEh)
In this level it is impossible to write in the Flash memory, BSB and SBV.
The Bootloader returns ID_ERROR message.
From level 1, one can write only level 2.
Level 2: RD_WR_SECURITY (FCh)
Level 2 forbids all read and write accesses to/from the Flash memory.
The Bootloader returns ID_ERROR message.
Only a full chip erase command can reset the software security bits.
Bit Position
Mnemonic
Default Value
Description
7
X2B
U
To start in x1 mode
6
BLJB
P
To map the boot area in code area between F800h-FFFFh
5
Reserved
U
4
Reserved
U
3
Reserved
U
2LB2
P
To lock the chip (see datasheet)
1LB1
U
0LB0
U
Level 0
Level 1
Level 2
Flash/EEPROM
Any access allowed
Read only access allowed
All access not allowed
Fuse bit
Any access allowed
Read only access allowed
All access not allowed
BSB & SBV & EB
Any access allowed
Read only access allowed
All access not allowed
SSB
Any access allowed
Write level2 allowed
Read only access allowed
Manufacturer info
Read only access allowed
Read only access allowed
All access not allowed
Bootloader info
Read only access allowed
Read only access allowed
All access not allowed
Erase block
Allowed
Not allowed
Not allowed
Full chip erase
Allowed
Allowed
Allowed
Blank check
Allowed
Allowed
Allowed




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