at89c5131 ATMEL Corporation, at89c5131 Datasheet - Page 39

• Manufacturer Part Number: at89c5131
• Description: 8-bit Flash Microcontroller With Full Speed Usb Device At89c5131
• Manufacturer: ATMEL Corporation

38
AT89C5131
Table 39. Software Registers
After programming the part by ISP, the BSB must be cleared (00h) in order to allow the
application to boot at 0000h.
The content of the Software Security Byte (SSB) is described in Table 40
To assure code protection from a parallel access, the HSB must also be at the required
level.
Table 40. Software Security Byte (SSB)
SBV
HSB
BSB
SSB
–
–
–
–
–
–
Number
Mnemonic
Bit
1-0
7
6
5
4
3
2
7
-
Mnemonic
LB1-0
Bit
6
-
Description
Software Boot Vector
Copy of the Hardware
Security Byte
Boot Status 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 Device ID #3:
Name
Revision
-
-
-
-
-
-
Description
Reserved
Do not clear this bit.
Reserved
Do not clear this bit.
Reserved
Do not clear this bit.
Reserved
Do not clear this bit.
Reserved
Do not clear this bit.
Reserved
Do not clear this bit.
User Memory Lock Bits
See Table 41
5
-
4
-
Default value
FCh
1011 1000b
0FFh
FFh
58h
D7h
F7h
FBh
EFh
FFh
3
-
2
-
–
–
–
–
Atmel
C51 X2, Electrically
Erasable
AT89C5131 32 Kbyte
AT89C5131 16 Kbyte
AT89C5131 32 Kbyte,
revision 0
AT89C5131 16 Kbyte,
revision 0
LB1
1
and
4136C–USB–04/05
Table 41.
LB0
0