- 您現(xiàn)在的位置：買賣IC網 > PDF目錄11642 > DS87C520-WCL (Maxim Integrated Products)IC MCU EPROM/ROM 33MHZ HS 40CDIP PDF資料下載
參數(shù)資料
| 型號： | DS87C520-WCL |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 20/43頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU EPROM/ROM 33MHZ HS 40CDIP |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 10 |
| 系列： | 87C |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 33MHz |
| 連通性： | EBI/EMI，SIO，UART/USART |
| 外圍設備： | 電源故障復位，WDT |
| 輸入/輸出數(shù)： | 32 |
| 程序存儲器容量： | 16KB（16K x 8） |
| 程序存儲器類型： | EPROM，UV |
| RAM 容量： | 1K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 4.5 V ~ 5.5 V |
| 振蕩器型： | 外部 |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | 40-CDIP（0.600"，15.24mm）窗口 |
| 包裝： | 管件 |
| 其它名稱： | DS87C520WCL |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁當前第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁
DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers
27 of 43
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
MEANING
30h
DAh
Manufacturer
31h
20h
Model
60h
01h
Extension
相關PDF資料 |
PDF描述 |
|---|---|
| VE-J6J-IZ-B1 | CONVERTER MOD DC/DC 36V 25W |
| D38999/20WG11SN | CONN RCPT 11POS WALL MNT W/SCKT |
| VE-J1B-IW-F1 | CONVERTER MOD DC/DC 95V 100W |
| VE-J14-IW-F4 | CONVERTER MOD DC/DC 48V 100W |
| MS27656T25F24S | CONN RCPT 24POS WALL MNT W/SCKT |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS87C530 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM MICRO WITH REAL TIME CLOCK |
| DS87C530_05 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM/ROM Microcontrollers with Real-Time Clock |
| DS87C530_1 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM/ROM Micro with Real Time Clock |
| DS87C530+ECL | 制造商:Maxim Integrated Products 功能描述:MICRO OTP RTC 33MHZ 52P TQFP PB-FRR - Trays |
發(fā)布緊急采購，3分鐘左右您將得到回復。