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AT89C5131A-RDTIM 数据表(PDF) 40 Page - ATMEL Corporation

部件名 AT89C5131A-RDTIM
功能描述  8-bit Flash Microcontroller with Full Speed USB Device
PDF  186 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

AT89C5131A-RDTIM 数据表(HTML) 40 Page - ATMEL Corporation

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40
AT89C5130A/31A-M
4337G–USB–11/06
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
and Table 41.
To assure code protection from a parallel access, the HSB must also be at the required
level.
The two lock bits provide different levels of protection for the on-chip code and data,
when programmed as shown to Table 41.
Address
Mnemonic
Description
Default value
01
SBV
Software Boot Vector
FFh
–
00
BSB
Boot Status Byte
0FFh
–
05
SSB
Software Security Byte
FFh
–
30
–
Copy of the Manufacturer
Code
58h
Atmel
31
–
Copy of the Device ID #1:
Family Code
D7h
C51 X2, Electrically
Erasable
60
–
Copy of the Device ID #2:
Memories
F7h
AT89C5130A/31A-M 32
Kbyte
61
–
Copy of the Device ID #3:
Name
DFh
AT89C5130A/31A-M 32
Kbyte, revision 0
Table 40.
Software Security Byte (SSB)
7654
3210
------
LB1
LB0
Bit
Number
Bit
Mnemonic
Description
7-
Reserved
Do not clear this bit.
6-
Reserved
Do not clear this bit.
5-
Reserved
Do not clear this bit.
4-
Reserved
Do not clear this bit.
3-
Reserved
Do not clear this bit.
2-
Reserved
Do not clear this bit.
1-0
LB1-0
User Memory Lock Bits
See Table 41



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