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参数资料
| 型号： | DS80C323-QCD |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Microcontroller |
| 英文描述： | 8-BIT, MROM, 18 MHz, MICROCONTROLLER, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 10/42页 |
| 文件大小： | 687K |
| 代理商： | DS80C323-QCD |
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DS80C320/DS80C323
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TIMED ACCESS PROTECTION
Selected SFR bits are critical to operation, making it desirable to protect against an accidental write
operation. The Timed Access procedure prevents an errant CPU from accidentally altering a bit that
would cause difficulty.
The Timed Access procedure requires that the write of a protected bit be
preceded by the following instructions:
MOV
0C7h, #0AAh
MOV
0C7h, #55h
By writing an AAh followed by a 55h to the Timed Access register (location C7h), the hardware opens a
three-cycle window that allows software to modify one of the protected bits. If the instruction that seeks
to modify the protected bit is not immediately proceeded by these instructions, the write will not take
effect. The protected bits are:
EXIF.0
BGS Band-gap Select
WDCON.6
POR Power-on Reset flag
WDCON.1
EWT Enable Watchdog
WDCON.0
RWT Reset Watchdog
WDCON.3
WDIF Watchdog Interrupt Flag
SPECIAL FUNCTION REGISTERS
Most special features of the DS80C320/DS80C323 or 80C32 are controlled by bits in special function
registers (SFRs). This allows the device to add many features but use the same instruction set. When
writing software to use a new feature, the SFR must be defined to an assembler or compiler using an
equate statement. This is the only change needed to access the new function. The DS80C320/DS80C323
duplicates the SFRs that are contained in the standard 80C32. Table 6 shows the register addresses and bit
locations. Many are standard 80C32 registers. The High-Speed Microcontroller User’s Guide describes
all SFRs.
相关PDF资料 |
PDF描述 |
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| DS80C390-FCR | 8-BIT, MROM, 100 MHz, MICROCONTROLLER, PQFP64 |
| DS80C390-QCR | 8-BIT, MROM, 100 MHz, MICROCONTROLLER, PQCC68 |
| DS80C390-QNR | 8-BIT, 40 MHz, MICROCONTROLLER, PQCC68 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS80C323-QCD/T&R | 制造商:Maxim Integrated Products 功能描述:MICRO HI SPD 3V 44PLCC T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MCU HI SPEED 18MHZ 44-PLCC 制造商:Maxim Integrated Products 功能描述:8-bit Microcontrollers - MCU High-Speed Low-Power |
| DS80C323-QCD/T&R | 功能描述:8位微控制器 -MCU High-Speed Low-Power 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 |
| DS80C323-QCD+ | 功能描述:8位微控制器 -MCU High-Speed Low-Power 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 |
| DS80C323-QCD+T&R | 制造商:Maxim Integrated Products 功能描述:MCU 8BIT CISC ROMLESS 3V 44PLCC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MCU HI SPEED 18MHZ 44-PLCC 制造商:Maxim Integrated Products 功能描述:8-bit Microcontrollers - MCU High-Speed Low-Power |
| DS80C323-QCD+T&R | 功能描述:8位微控制器 -MCU High-Speed Low-Power 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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