參數(shù)資料
型號(hào)： DS87C520
英文描述： EPROM/ROM High-Speed Micro
中文描述： EPROM/ROM高速微控制器
文件頁(yè)數(shù)： 27/45頁(yè)
文件大?。?/td> 1415K
代理商： DS87C520
DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers
27 of 45
Encryption Array
The Encryption Array allows an authorized user to verify EPROM without allowing the true memory to
be dumped. During a verify, each byte is Exclusive NORed (XNOR) with a byte in the Encryption Array.
This results in a true representation of the EPROM while the Encryption is unprogrammed (FFh). Once
the Encryption Array is programmed in a non-FFh state, the verify value will be encrypted.
For encryption to be effective, the Encryption Array must be unknown to the party that is trying to verify
memory. The entire EPROM also should be a non-FFh state or the Encryption Array can be discovered.
The Encryption Array is programmed as shown in Table 9. Note that the programmer cannot read the
array. Also note that the verify operation always uses the Encryption Array. The array has no impact
while FFh. Simply programming the array to a non-FFh state will cause the encryption to function.
OTHER EPROM OPTIONS
The DS87C520 has user selectable options that must be set before beginning software execution. These
options use EPROM bits rather than SFRs.
Program the EPROM selectable options as shown in Table 9. The Option Register sets or reads these
selections. The bits in the Option Control Register have the following function:
Bits 7 to 4
Reserved, program to a 1.
Bit 3
Watchdog POR default. Set = 1; watchdog reset function is disabled on power-up.
Set = 0; watchdog reset function is enabled automatically.
Bits 2 to 0
Reserved. Program to a 1.
SIGNATURE
The Signature bytes identify the product and programming revision to EPROM programmers. This
information is at programming addresses 30h, 31h, and 60h.
ADDRESS
VALUE
30h
DAh
31h
20h
60h
01h
MEANING
Manufacturer
Model
Extension
相關(guān)PDF資料
PDF描述
DS87C520-ECL EPROM/ROM High-Speed Micro
DS87C520-ENL EPROM/ROM High-Speed Micro
DS87C520-MCL EPROM/ROM High-Speed Micro
DS87C520-MNL EPROM/ROM High-Speed Micro
DS87C520-QCL EPROM/ROM High-Speed Micro
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS87C520_1 制造商:DALLAS 制造商全稱(chēng):Dallas Semiconductor 功能描述:EPROM/ROM High-Speed Micro
DS87C520+ECL 制造商:Maxim Integrated Products 功能描述:MICRO OTP HI SPD 44TQFP 33MHZ PB-FR - Trays
DS87C520+MCL 制造商:Maxim Integrated Products 功能描述:MICRO OTP HI SPD 40PDIP 33MHZ PB-FR - Rail/Tube 制造商:Maxim Integrated Products 功能描述:IC 8BIT CPU CMOS 87C520 DIP40
DS87C520+MNL 制造商:Maxim Integrated Products 功能描述:MICRO HI SPD 40PDIP 33MHZ IND PB-FR - Rail/Tube
DS87C520+QCL 制造商:Maxim Integrated Products 功能描述:MCU 8BIT CISC 16KB EPROM 5V 44PLCC - Rail/Tube
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