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參數(shù)資料
| 型號： | DS87C520-ECL |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 18/43頁 |
| 文件大小： | 0K |
| 描述： | IC MCU EPROM/ROM 33MHZ HS 44TQFP |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS |
| 產(chǎn)品變化通告： | Product Discontinuation 20/Feb/2012 |
| 標準包裝： | 160 |
| 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(shè)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： | OTP |
| 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： | 44-TQFP |
| 包裝： | 托盤 |
| 其它名稱： | DS87C520ECL |
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DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers
25 of 43
TIMED-ACCESS PROTECTION
It is useful to protect certain SFR bits from an accidental write operation. The Timed Access procedure
stops an errant CPU from accidentally changing these bits. It requires that the following instructions
precede a write of a protected bit.
MOV
0C7h,
#0Aah
MOV
0C7h,
#55h
Writing an AAh then a 55h to the Timed Access register (location C7h) opens a 3-cycle window for write
access. The window allows software to modify a protected bit(s). If these instructions do not immediately
precede the write operation, then the write will not take effect. The protected bits are:
EXIF.0
BGS
Bandgap Select
WDCON.6
POR
Power-On Reset flag
WDCON.1
EWT
Enable Watchdog Reset
WDCON.0
RWT
Restart Watchdog
WDCON.3
WDIF
Watchdog Interrupt Flag
ROMSIZE.2
RMS2
ROM Size Select 2
ROMSIZE.1
RMS1
ROM Size Select 1
ROMSIZE.0
RMS0
ROM Size Select 0
EPROM PROGRAMMING
The DS87C520 follows standards for a 16kB EPROM version in the 8051 family. It is available in a UV-
erasable, ceramic-windowed package and in plastic packages for one-time user-programmable versions.
The part has unique signature information so programmers can support its specific EPROM options.
ROM-specific features are described later in this data sheet.
Most commercially available device programmers will directly support Dallas Semiconductor
microcontrollers. If your programmer does not, please contact the manufacturer for updated software.
PROGRAMMING PROCEDURE
The DS87C520 should run from a clock speed between 4MHz and 6MHz when being programmed. The
programming fixture should apply address information for each byte to the address lines and the data
value to the data lines. The control signals must be manipulated as shown in Table 9. The diagram in
Table 5 shows the expected electrical connection for programming. Note that the programmer must apply
addresses in demultiplexed fashion to Ports 1 and 2 with data on Port 0. Waveforms and timing are
provided in the Electrical Specifications section.
Program the DS87C520 as follows:
1) Apply the address value,
2) Apply the data value,
3) Select the programming option from Table 9 using the control signals,
4) Increase the voltage on VPP from 5V to 12.75V if writing to the EPROM,
5) Pulse the PROG signal five times for EPROM array and 25 times for encryption table, lock bits, and
other EPROM bits,
6) Repeat as many times as necessary.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS87C520-ECL+ | 功能描述:8位微控制器 -MCU EPROM/ROM High-Speed RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| DS87C520-ENL | 功能描述:8位微控制器 -MCU EPROM/ROM High-Speed RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| DS87C520-ENL+ | 功能描述:8位微控制器 -MCU EPROM/ROM High-Speed RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| DS87C520-FCL | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| DS87C520MCL | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM/ROM High-Speed Microcontrollers |
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