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T89C51RD2-RDTIL Datasheet(PDF) 64 Page - ATMEL Corporation

Part # T89C51RD2-RDTIL
Description  0 to 40 MHz Flash Programmable 8-bit Microcontroller
PDF  104 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T89C51RD2-RDTIL Datasheet(HTML) 64 Page - ATMEL Corporation

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T89C51RD2
4243G–8051–05/03
Functional Description
Configuration and
Manufacturer Information
The table below lists Configuration and Manufacturer byte information used by the boot-
loader. This information can be accessed through a set of API or ISP commands.
Software Security Bits (SSB)
The SSB protects any Flash access from ISP command.
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 (10h )
For this level it is impossible to write in the Flash memory, BSB and SBV.
The Bootloader returns ’P’ on write access.
From level 1, one can write only level 2.
•
level 2: RD_WR_SECURITY (00h
The level 2 forbids all read and write accesses to/from the Flash/EEPROM memory.
The Bootloader returns ’L’ on read or write access.
Only a full chip erase in parallel mode (using a programmer) or ISP command can reset
the software security bits.
From level 2, one cannot read and write anything.
Table 38. Software Security Byte Behavior
Mnemonic
Description
Default Value
BSB
Boot Status Byte
FFh
SBV
Software Boot Vector
FCh
SSB
Software Security Byte
FFh
Manufacturer Id
58h
Id1: Family code
D7h
Id2: Product Name
FCh
Id3: Product Revision
FFh
Level 0
Level 1
Level 2
Flash/EEPROM
Any access allowed
Read only access allowed
Any access not allowed
Fuse Bit
Any access allowed
Read only access allowed
Any access not allowed
BSB & SBV
Any access allowed
Read only access allowed
Any access not allowed
SSB
Any access allowed
Write level 2 allowed
Read only access allowed



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