at89c5131a ATMEL Corporation, at89c5131a Datasheet - Page 4

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at89c5131a

Manufacturer Part Number
at89c5131a
Description
Usb Microcontrollers
Manufacturer
ATMEL Corporation
Datasheet

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Mapping and Default Value of
Hardware Security Byte
Security
4
AT89C5131A USB Bootloader
The 4 MSB of the Hardware Byte can be read/written by software (this area is called
Fuse bits). The 4 LSB can only be read by software and written by hardware in parallel
mode (with parallel programmer devices).
Note:
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:
Only a full chip erase command can reset the software security bits.
Flash/EEPROM
Fuse bit
BSB & SBV & EB Any access allowed
SSB
Manufacturer info Read only access allowed
Bootloader info
Erase block
Full chip erase
Blank Check
Bit Position
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.
The Bootloader returns an err_WRITE status.
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 an err_WRITE or an err_VENDOR status.
7
6
5
4
3
2
1
0
U: Unprogrammed = 1
P: Program = 0
Mnemonic
OSCON1
OSCON0
reserved
BLJB
Level 0
Any access allowed
Any access allowed
Any access allowed
Read only access allowed
Allowed
Allowed
Allowed
X2B
LB2
LB1
LB0
Default Value
U
U
U
U
U
U
P
P
Description
To start in x1 mode
To map the boot area in code area between F800h-FFFFh
Oscillator control (bit 1)
Oscillator control (bit 0)
To lock the chip (see datasheet)
Level 1
Read only access allowed
Read only access allowed
Any access allowed
Write level2 allowed
Read only access allowed
Read only access allowed
Not allowed
Allowed
Allowed
Level 2
All access not allowed
All access not allowed
Any access allowed
Read only access allowed
Read only access allowed
Read only access allowed
Not allowed
Allowed
Allowed
4287C–USB–11/04

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