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參數(shù)資料
| 型號： | DS83C530-QCL |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | EPROM/ROM Microcontrollers with Real-Time Clock |
| 中文描述： | 8-BIT, UVPROM, 33 MHz, MICROCONTROLLER, CQCC52 |
| 封裝： | WINDOWED, CERQUAD-52 |
| 文件頁數(shù)： | 28/46頁 |
| 文件大?。?/td> | 749K |
| 代理商： | DS83C530-QCL |
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DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock
28 of 46
DS87C530 SECURITY OPTIONS
The DS87C530 employs a standard three-level lock that restricts viewing of the EPROM contents. A 64-
byte Encryption Array allows the authorized user to verify memory by presenting the data in encrypted
form.
Lock Bits
The security lock consists of 3 lock bits. These bits select a total of 4 levels of security. Higher levels
provide increasing security but also limit application flexibility. Table 10 shows the security settings.
Note that the programmer cannot directly read the state of the security lock. User software has access to
this information as described in the Memory section.
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 DS87C530 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 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 1.
DS87C530 Signature
The Signature bytes identify the product and programming revision to EPROM programmers. This
information is at programming addresses 30h, 31h, and 60h. This information is as follows:
ADDRESS
VALUE
30h
DAh
31h
30h
60h
01h
MEANING
Manufacturer
Model
Extension
相關PDF資料 |
PDF描述 |
|---|---|
| DS87C530-ECL | EPROM/ROM Microcontrollers with Real-Time Clock |
| DS83C530-DS87C530 | EPROM/ROM Microcontrollers with Real-Time Clock |
| DS83C530-ECL | EPROM/ROM Microcontrollers with Real-Time Clock |
| DS83C530-ENL | EPROM/ROM Microcontrollers with Real-Time Clock |
| DS83C530-QNL | EPROM/ROM Microcontrollers with Real-Time Clock |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS83C530-QCL+ | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM/ROM Microcontrollers with Real-Time Clock |
| DS83C530-QNL | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:EPROM/ROM Microcontrollers with Real-Time Clock |
| DS83C530-QNL+ | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM/ROM Microcontrollers with Real-Time Clock |
| DS83CH20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral (Multifunction) Controller |
| DS84 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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