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參數(shù)資料
| 型號： | DS87C520 |
| 英文描述： | EPROM/ROM High-Speed Micro |
| 中文描述： | EPROM/ROM高速微控制器 |
| 文件頁數(shù)： | 28/45頁 |
| 文件大小： | 1415K |
| 代理商： | DS87C520 |
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DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers
28 of 45
Figure 5. EPROM Programming Configuration
ROM-SPECIFIC FEATURES
The DS83C520 supports a subset of the EPROM features found on the DS87C520.
SECURITY OPTIONS
Lock Bits
The DS83C520 employs a lock that restricts viewing of the ROM contents. When set, the lock will
prevent MOVC instructions in external memory from reading program bytes in internal memory. When
locked, the
EA
pin is sampled and latched on reset. The lock setting is enabled or disabled when the
devices are manufactured according to customer specifications. The lock bit cannot be read in software,
and its status can only be determined by observing the operation of the device.
Encryption Array
The DS83C520 Encryption Array allows an authorized user to verify ROM without allowing the true
memory contents 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 ROM while the Encryption is
unprogrammed (FFh)
.
Once the Encryption Array is programmed in a non-FFh state, the Encryption
Array is programmed (or optionally left unprogrammed) when the devices are manufactured according to
customer specifications.
相關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 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS87C520_1 | 制造商:DALLAS 制造商全稱: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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