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参数资料
| 型号： | IS80C32-40PLI |
| 厂商： | INTEGRATED SILICON SOLUTION INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, 40 MHz, MICROCONTROLLER, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 33/48页 |
| 文件大小： | 379K |
| 代理商： | IS80C32-40PLI |
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IS80C52
IS80C32
Integrated Silicon Solution, Inc. — 1-800-379-4774
39
MC004-1D
11/19/98
ISSI
Encryption Array
Within the ROM array are 32 bytes of Encryption Array
that are initially unprogrammed (all 1's). Every time that a
byte is addressed during verify, five 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 Encryption verify byte. The algorithm, with the
array in the unprogrammed state (all 1's), will return the
code in its original, unmodified form.
When using the encryption array, one important factor
needs to be considered. If a code byte has the value
0FFH, verifying the byte will produce the encryption byte
value. If a large block (> 32 bytes) of code is left
unprogrammed, a verification routine will display the
contents of the encryption array. For this reason, all
unused code bytes should be programmed with some
value other than 0FFH, and not all of them the same value.
ROM Lock System
The program lock system, when programmed, protects
the ROM code against software piracy. The IS80C52/32
has a two-level program lock system (see Table 14) and
a 32-byte encryption table. No matter what lock bit is, the
user submits the encryption table with his or her code in
verify ROM mode. Both the lock-bit and encryption array
Table 14. Program Lock Bits
LB1
LB2
Protection Type
1
U
No Program Lock Features enabled. (Code verify will still be
encrypted by the Encryption Array if Programmed)
2
P
U
MOVC instructions executed from external program memory
are diabled form fetching code bytes from internal memory,
EA is sampled and latched on Reset.
3
P
Same as 2, also ROM verify is disabled.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IS80C32-40PQ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| IS80C32-40PQI | 制造商:ISSI 制造商全称:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
| IS80C32-40W | 制造商:ISSI 制造商全称:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
| IS80C32-40WI | 制造商:ISSI 制造商全称:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
| IS80C32-L16 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
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