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參數(shù)資料
| 型號： | DS80C320 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Speed/Low-Power Microcontrollers |
| 中文描述： | 高速/低功耗微控制器 |
| 文件頁數(shù)： | 18/42頁 |
| 文件大小： | 1501K |
| 代理商： | DS80C320 |
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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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS80C320-ECG | Strain Relief |
| DS80C320-ECL | High-Speed/Low-Power Microcontrollers |
| DS80C320-ENG | High-Speed/Low-Power Microcontrollers |
| DS80C320-ENL | High-Speed/Low-Power Microcontrollers |
| DS80C320-MCG | High-Speed/Low-Power Microcontrollers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS80C320_06 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:High-Speed/Low-Power Microcontrollers |
| DS80C320+ENL | 制造商:Maxim Integrated Products 功能描述:MCU 8BIT CISC ROMLESS 5V 44TQFP - Trays |
| DS80C320+FCG | 制造商:Maxim Integrated Products 功能描述:MICRO HI SPD 44PQFP 25MHZ PB-FREE - Trays |
| DS80C320+FNG | 制造商:Maxim Integrated Products 功能描述:MICRO HS 44MQFP 25MHZ IND PB-FREE - Trays |
| DS80C320+MCG | 制造商:Maxim Integrated Products 功能描述:MCU 8BIT CISC ROMLESS 5V 40PDIP - Rail/Tube 制造商:Maxim Integrated Products 功能描述:IC 8BIT CPU CMOS 80C320 DIP40 制造商:Maxim Integrated Products 功能描述:IC, 8BIT CPU CMOS, 80C320, DIP40 制造商:Maxim Integrated Products 功能描述:IC, 8BIT CPU CMOS, 80C320, DIP40; Controller Family/Series:(8051) 8052; Core Size:8bit; No. of I/O's:32; Supply Voltage Min:4.5V; Supply Voltage Max:5.5V; Digital IC Case Style:DIP; No. of Pins:40; RAM Memory Size:256Byte; CPU ;RoHS Compliant: Yes |
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