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参数资料
| 型号： | AT83C5112 |
| 厂商： | Atmel Corp. |
| 英文描述： | 8-bit Microcontroller with A/D Converter |
| 中文描述： | 8位微控制器与A / D转换器 |
| 文件页数： | 62/97页 |
| 文件大小： | 1229K |
| 代理商： | AT83C5112 |
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62
AT8xC5112
4191B
–
8051
–
04/03
ROM
ROM Structure
The T83C5112 ROM memory is divided in three different arrays:
the code array: 8K bytes
the encryption array: 64 bytes
the signature array: 4 bytes
ROM Lock System
The program Lock system, when programmed, protects the on-chip program against
software piracy.
Encryption Array
Within the ROM array are 64 bytes of encryption array. Every time a byte is addressed
during program verify, 6 address lines are used to select a byte of the encryption array.
This byte is then exclusive-NOR
’
ed (XNOR) with the code byte, creating an encrypted
verify byte. The algorithm, with the encryption array in the unprogrammed state, will
return the code in its original, unmodified form.
When using the encryption array, one important factor needs to be considered. If a byte
has the value FFh, verifying the byte will produce the encryption byte value. If a large
block (>64 bytes) of code is left unprogrammed, a verification routine will display the
content of the encryption array. For this reason all the unused code bytes should be pro-
grammed with random values.
Program Lock Bits
The lock bits when programmed according to Table 41. will provide different level of pro-
tection for the on-chip code and data.
U: unprogrammed
P: programmed
Signature Bytes
The T83C5112 contains 4 factory programmed signatures bytes. To read these bytes,
perform the process described in Section
“
Signature Bytes
”
, page 72.
Verify Algorithm
Refer to Section
“
Verify Algorithm
”
, page 74.
Program Lock Bits
Protection Description
Security
level
LB1
LB2
1
U
U
No program lock features enabled. Code verify will still be encrypted by
the encryption array if programmed. MOVC instruction executed from
external program memory returns non encrypted data.
2
P
U
MOVC instruction executed from external program memory are disabled
from fetching code bytes from internal memory, EA is sampled and latched
on reset.
3
U
P
Same as 2, also verify is disabled
This security level is available because ROM integrity will be verified
thanks to another method.
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| AT83C5121 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with Multiprotocol Smart Card Interface |
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| AT83C5121XXX-PURUL | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with Multiprotocol Smart Card Interface |
| AT83C5121XXX-PUTUL | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with Multiprotocol Smart Card Interface |
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