參數(shù)資料
型號(hào)： DS80C320-ENL
廠商： DALLAS SEMICONDUCTOR
元件分類： Microcontroller
英文描述： 8-BIT, MROM, 33 MHz, MICROCONTROLLER, PQFP44
封裝： TQFP-44
文件頁(yè)數(shù)： 2/42頁(yè)
文件大?。?/td> 736K
代理商： DS80C320-ENL
DS80C320/DS80C323
10 of 42
SPEED ADVANTAGE SUMMARY
#Opcodes
Speed Improvement
159
3.0 x
51
1.5 x
43
2.0 x
2
2.4 x
255
Average: 2.5
MEMORY ACCESS
The DS80C320/DS80C323 contains no on-chip ROM and 256 bytes of scratchpad RAM. Off-chip
memory is accessed using the multiplexed address/data bus on P0 and the MSB address on P2. A typical
memory connection is shown in Figure 3. Timing diagrams are provided in the Electrical Specifications.
Program memory (ROM) is accessed at a fixed rate determined by the crystal frequency and the actual
instructions. As mentioned above, an instruction cycle requires 4 clocks. Data memory (RAM) is
accessed according to a variable speed MOVX instruction as described below.
TYPICAL MEMORY CONNECTION Figure 3
STRETCH MEMORY CYCLE
The DS80C320/DS80C323 allows the application software to adjust the speed of data memory access.
The microcontroller is capable of performing the MOVX in as little as two instruction cycles. However,
this value can be stretched as needed so that both fast memory and slow memory or peripherals can be
accessed with no glue logic. Even in high-speed systems, it may not be necessary or desirable to perform
data memory access at full speed. In addition, there are a variety of memory mapped peripherals such as
LCD displays or UARTs that are not fast.
The Stretch MOVX is controlled by the Clock Control Register at SFR location 8Eh as described below.
This allows the user to select a stretch value between 0 and 7. A Stretch of 0 will result in a two-machine
cycle MOVX. A Stretch of 7 will result in a MOVX of nine machine cycles. Software can dynamically
change this value depending on the particular memory or peripheral.
相關(guān)PDF資料
PDF描述
DS80C320-ENG 8-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP44
DS80C320-MCG 8-BIT, MROM, 25 MHz, MICROCONTROLLER, PDIP40
DS80C320-QNG 8-BIT, MROM, 25 MHz, MICROCONTROLLER, PQCC44
DS80C320-ECG 8-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP44
DS80C320-FNG 8-BIT, 25 MHz, MICROCONTROLLER, PQFP44
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS80C320-ENL+ 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(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
DS80C320-ENR 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High-Speed Microcontroller User Guide
DS80C320-FCD 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High-Speed Microcontroller User Guide
DS80C320-FCG 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(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
DS80C320-FCG+ 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(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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