參數(shù)資料
型號(hào)： DS80C320-ECL
英文描述： High-Speed/Low-Power Micro
中文描述： High-Speed/Low-Power微
文件頁(yè)數(shù)： 11/42頁(yè)
文件大?。?/td> 1501K
代理商： DS80C320-ECL
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-ENG High-Speed/Low-Power Micro
DS80C320-QNL High-Speed/Low-Power Micro
DS80C320-MCG High-Speed/Low-Power Micro
DS80C320-MCL High-Speed/Low-Power Micro
DS80C320-MNG High-Speed/Low-Power Micro
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS80C320-ECL/T&R 制造商:Maxim Integrated Products 功能描述:IC MCU HI SPEED 33MHZ 44-TQFP
DS80C320-ECL/T&R 功能描述:IC MCU HI SPEED 33MHZ 44-TQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:80C 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設(shè)備:LED，POR，WDT 輸入/輸出數(shù):9 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件
DS80C320-ECL+ 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-ECR 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High-Speed Microcontroller User Guide
DS80C320-END 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High-Speed Microcontroller User Guide
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