參數(shù)資料
型號(hào)： DS87C520-ENL
英文描述： EPROM/ROM High-Speed Micro
中文描述： 存儲(chǔ)器/ ROM的高速微
文件頁(yè)數(shù)： 8/45頁(yè)
文件大?。?/td> 1415K
代理商： DS87C520-ENL
DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers
8 of 45
The relative time of two instructions might be different in the new architecture than it was previously. For
example, in the original architecture, the “MOVX A, @DPTR” instruction and the “MOV direct, direct”
instruction used two machine cycles or 24 oscillator cycles. Therefore, they required the same amount of
time. In the DS87C520/DS83C520, the MOVX instruction takes as little as two machine cycles or eight
oscillator cycles but the “MOV direct, direct” uses three machine cycles or 12 oscillator cycles. While
both are faster than their original counterparts, they now have different execution times. This is because
the DS87C520/DS83C520 usually use one instruction cycle for each instruction byte. The user concerned
with precise program timing should examine the timing of each instruction for familiarity with the
changes. Note that a machine cycle now requires just 4 clocks, and provides one ALE pulse per cycle.
Many instructions require only one cycle, but some require five. In the original architecture, all were one
or two cycles except for MUL and DIV. Refer to the
High-Speed Microcontroller User’s Guide
for
details and individual instruction timing.
SPECIAL FUNCTION REGISTERS
Special Function Registers (SFRs) control most special features of the DS87C520/DS83C520. This
allows the DS87C520/DS83C520 to have many new features but use the same instruction set as the 8051.
When writing software to use a new feature, an equate statement defines the SFR to an assembler or
compiler. This is the only change needed to access the new function. The DS87C520/DS83C520
duplicate the SFRs contained in the standard 80C52. Table 1 shows the register addresses and bit
locations. The
High-Speed Microcontroller User’s Guide
describes all SFRs.
相關(guān)PDF資料
PDF描述
DS87C520-MCL EPROM/ROM High-Speed Micro
DS87C520-MNL EPROM/ROM High-Speed Micro
DS87C520-QCL EPROM/ROM High-Speed Micro
DS87C520-QNL EPROM/ROM High-Speed Micro
DS87C520-WCL EPROM/ROM High-Speed Micro
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
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
DS87C520-MCL 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
DS87C520-MCL+ 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
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