參數(shù)資料
型號(hào)： 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)： 11/42頁
文件大?。?/td> 1501K
代理商： DS80C320
DS80C320/DS80C323
11 of 42
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(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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*