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參數(shù)資料
| 型號： | DS80C320-MCL |
| 英文描述： | High-Speed/Low-Power Micro |
| 中文描述： | High-Speed/Low-Power微 |
| 文件頁數(shù)： | 18/42頁 |
| 文件大?。?/td> | 1501K |
| 代理商： | DS80C320-MCL |
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DS80C320/DS80C323
18 of 42
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS80C320-MNG | High-Speed/Low-Power Micro |
| DS80C320-MNL | High-Speed/Low-Power Micro |
| DS80C320-QCG | High-Speed/Low-Power Micro |
| DS80C323 | High-Speed/Low-Power Micro |
| DS80C323-ECD | High-Speed/Low-Power Micro |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS80C320MCL+ | 制造商:DSC 功能描述: |
| DS80C320-MCL+ | 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 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(fēng)格:SMD/SMT |
| DS80C320-MCR | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High-Speed Microcontroller User Guide |
| DS80C320-MEL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| DS80C320-MND | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High-Speed Microcontroller User Guide |
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