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參數資料
| 型號： | DS80C320-QCL |
| 英文描述： | High-Speed/Low-Power Micro |
| 中文描述： | High-Speed/Low-Power微 |
| 文件頁數： | 11/42頁 |
| 文件大小： | 1501K |
| 代理商： | DS80C320-QCL |
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DS80C320/DS80C323
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On reset, the Stretch value will default to a 1, resulting in a three-cycle MOVX. Therefore, RAM access
will not be performed at full speed. This is a convenience to existing designs that may not have fast RAM
in place. When maximum speed is desired, the software should select a Stretch value of 0. When using
very slow RAM or peripherals, a larger stretch value can be selected. Note that this affects data memory
only and the only way to slow program memory (ROM) access is to use a slower crystal.
Using a Stretch value between 1 and 7 causes the microcontroller to stretch the read/write strobe and all
related timing. This results in a wider read/write strobe allowing more time for memory/peripherals to
respond. The timing of the variable speed MOVX is shown in the Electrical Specifications. Note that full
speed access is not the reset default case. Table 3 below shows the resulting strobe widths for each
Stretch value. The memory stretch is implemented using the Clock Control Special Function Register at
SFR location 8Eh. The stretch value is selected using bits CKCON.2-0. In the table, these bits are referred
to as M2 through M0. The first stretch (default) allows the use of common 120 ns or 150 ns RAMs
without dramatically lengthening the memory access.
DATA MEMORY CYCLE STRETCH VALUES
Table 3
CKCON.2-0
MEMORY
RD
or
WR
STROBE
MD2
MD1
MD0
CYCLES
WIDTH IN CLOCKS
0
0
0
2
2
0
0
1
3 (default)
4
0
1
0
4
8
0
1
1
5
12
1
0
0
6
16
1
0
1
7
20
1
1
0
8
24
1
1
1
9
28
STROBE WIDTH
TIME @ 25 MHz
80 ns
160 ns
320 ns
480 ns
640 ns
800 ns
960 ns
1120 ns
相關PDF資料 |
PDF描述 |
|---|---|
| DS80C320 | High-Speed/Low-Power Micro |
| DS80C320-ECG | High-Speed/Low-Power Micro |
| DS80C320-ECL | High-Speed/Low-Power Micro |
| DS80C320-ENG | High-Speed/Low-Power Micro |
| DS80C320-QNL | High-Speed/Low-Power Micro |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DS80C320-QCL/T&R | 制造商:Maxim Integrated Products 功能描述:MICRO, HI SPD, 44PLCC, 33MHZ, TRL - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MCU HI SPEED 33MHZ 44-PLCC 制造商:Maxim Integrated Products 功能描述:8-bit Microcontrollers - MCU High-Speed Low-Power |
| DS80C320-QCL/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 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT |
| DS80C320-QCL+ | 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 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT |
| DS80C320-QCL+T&R | 制造商:Maxim Integrated Products 功能描述:MCU 8BIT CISC ROMLESS 5V 44PLCC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MCU HI SPEED 33MHZ 44-PLCC 制造商:Maxim Integrated Products 功能描述:8-bit Microcontrollers - MCU High-Speed Low-Power |
| DS80C320-QCL+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 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT |
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