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参数资料
| 型号： | DS87C520-QCL/T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/43页 |
| 文件大小： | 0K |
| 描述： | IC MCU EPROM/ROM 33MHZ HS 44PLCC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 500 |
| 系列： | 87C |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 33MHz |
| 连通性： | EBI/EMI，SIO，UART/USART |
| 外围设备： | 电源故障复位，WDT |
| 输入/输出数： | 32 |
| 程序存储器容量： | 16KB（16K x 8） |
| 程序存储器类型： | OTP |
| RAM 容量： | 1K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 4.5 V ~ 5.5 V |
| 振荡器型： | 外部 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 44-LCC（J 形引线） |
| 包装： | 带卷 (TR) |
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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.
相关PDF资料 |
PDF描述 |
|---|---|
| DS87C520-QCL | IC MCU EPROM/ROM 33MHZ HS 44PLCC |
| DS87C520-MCL | IC MCU EPROM/ROM 33MHZ HS 40-DIP |
| DS5002FPM-16 | IC MPU SECURE 16MHZ 80-TQFP |
| VI-BNY-IV-F4 | CONVERTER MOD DC/DC 3.3V 99W |
| VI-BNY-IV-F3 | CONVERTER MOD DC/DC 3.3V 99W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS87C520QNL | 制造商:Other 功能描述:EPROM/ROM High-Speed Micro |
| DS87C520-QNL | 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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| DS87C520-QNL/T&R | 制造商:Maxim Integrated Products 功能描述:MICRO OTP HISPD 44PLCC 33MHZ IND TR - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MCU EPROM/ROM 33MH IND 44PLCC |
| DS87C520-QNL/T&R | 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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| DS87C520-QNL+ | 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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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