T89C51RD2-3CBC-L ATMEL [ATMEL Corporation], T89C51RD2-3CBC-L Datasheet - Page 54

• Manufacturer Part Number: T89C51RD2-3CBC-L
• Description: 0 to 40MHz Flash Programmable 8-bit Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

They are several software registers described in Table 29
After programming the part by ISP, the BSB must be reset (00h) in order to allow the application to boot at 0000h.
The content of the Software Security Byte (SSB) is described in
To assure code protection from a parallel access, the HSB must also be at the required level.
The three lock bits provide different levels of protection for the on-chip code and data, when programmed according
to Table 31.
Rev. F - 15 February, 2001
Number
Bit
1-3
7
6
5
4
0
7
-
Mnemonic
Mnemonic
SBV
HSB
LB1
LB0
BSB
SSB
Bit
-
-
-
-
6
-
Boot Status Byte
Software Boot Vector
Copy of the Hardware security byte
Software Security Byte
Copy of the Manufacturer Code
Copy of the Device ID #1: Family Code
Copy of the Device ID #2: memories
size and type
Copy of the
sion
Reserved
Reserved
Reserved
User Memory Lock Bit
Reserved
User Memory Lock Bit
Do not clear this bit.
Do not clear this bit.
Do not clear this bit.
See Table 31
Do not clear this bit.
See Table 31
5
-
Table 30. Software Security Byte (SSB)
Device ID # 3: name and revi-
Table 29. Default values
LB1
4
FFh
FCh
18h or 1Bh
FFh
58h
D7h
FCh
FFh
Default value
3
-
Description
Table 30
and
ATMEL Wireless and
Microcontrollers
C51 X2, Electrically Erasable
T89C51RD2
T89C51RD2
2
-
Table 31
T89C51RD2
, revision 0
memories size
1
-
LB0
0
54