The PCA9557 is a silicon CMOS circuit which provides parallel input/output expansion for SMBus and I2C-bus applications. The PCA9557 consists of an 8-bit input port register, 8-bit output port register, and an I2C-bus/SMBus interface. It has low current consumption and a high-impedance open-drain output pin, IO0. The system master can enable the PCA9557’s I/O as either input or output by writing to the configuration register. The system master can also invert the PCA9557 inputs by writing to the active HIGH polarity inversion register. Finally, the system master can reset the PCA9557 in the event of a time-out by asserting a LOW in the reset input. The power-on reset puts the registers in their default state and initializes the I2C-bus/SMBus state machine. The RESET pin causes the same reset/initialization to occur without de-powering the part.
標(biāo)簽: C-bus SMBus reset port
上傳時(shí)間: 2014-01-18
上傳用戶:bs2005
RSM-4055 是帶隔離的數(shù)字量輸入輸出模塊。模塊有8 路隔離數(shù)字量輸入,8 路隔離數(shù)字量輸出。數(shù)字量輸入可支持開關(guān)觸點(diǎn)信號(hào)或電平信號(hào),數(shù)字量輸出采用開漏輸出,最大負(fù)載可達(dá)50V,50mA,同時(shí)模塊的DI 通道還具有計(jì)數(shù)功能,能對(duì)小于2kHz 的數(shù)字脈沖信號(hào)進(jìn)行計(jì)數(shù),DI 輸入檢測(cè)和計(jì)數(shù)都具有數(shù)字濾波功能能有效濾掉干擾信號(hào),數(shù)字輸入檢測(cè)和計(jì)數(shù)可同時(shí)使用。模塊適用于采集工業(yè)現(xiàn)場(chǎng)的數(shù)字量信號(hào)以及控制功率繼電器等。
標(biāo)簽: 4055 RSM 隔離 數(shù)字量
上傳時(shí)間: 2013-11-10
上傳用戶:zl520l
The CAT9534 is an 8-bit parallel input/output portexpander for I²C and SMBus compatible applications.These I/O expanders provide a simple solution inapplications where additional I/Os are needed: sensors,power switches, LEDs, pushbuttons, and fans.The CAT9534 consists of an input port register, anoutput port register, a configuration register, a polarityinversion register and an I²C/SMBus-compatible serialinterface.
上傳時(shí)間: 2013-11-09
上傳用戶:liulinshan2010
AT89C2051是一個(gè)低電壓,高性能CMOS 8位單片機(jī),片內(nèi)含2k bytes的可反復(fù)擦寫的只讀Flash程序存儲(chǔ)器和128 bytes的隨機(jī)存取數(shù)據(jù)存儲(chǔ)器(RAM),器件采用ATMEL公司的高密度、非易失性存儲(chǔ)技術(shù)生產(chǎn),兼容標(biāo)準(zhǔn)MCS-51指令系統(tǒng),片內(nèi)置通用8位中央處理器和Flash存儲(chǔ)單元,功能強(qiáng)大AT89C2051單片機(jī)可為您提供許多高性價(jià)比的應(yīng)用場(chǎng)合。AT89C2051是一個(gè)功能強(qiáng)大的單片機(jī),但它只有20個(gè)引腳,15個(gè)雙向輸入/輸出(I/O)端口,其中P1是一個(gè)完整的8位雙向I/O口,兩個(gè)外中斷口,兩個(gè)16位可編程定時(shí)計(jì)數(shù)器,兩個(gè)全雙向串行通信口,一個(gè)模擬比較放大器。
上傳時(shí)間: 2014-04-16
上傳用戶:ippler8
文章提出了一種精簡(jiǎn)指令集8 位單片機(jī)中, 算術(shù)邏輯單元的工作原理。在此基礎(chǔ)上, 對(duì)比傳統(tǒng)PIC 方案、以及在ALU 內(nèi)部再次采用流水線作業(yè)的332 方案、44 方案, 并用Synopsys 綜合工具實(shí)現(xiàn)了它們。綜合及仿真結(jié)果表明, 根據(jù)該單片機(jī)系統(tǒng)要求, 44 方案速度最高, 比332 方案可提高43.9%, 而面積僅比最小的332 方案增加1.6%。在分析性能差異的根本原因之后, 闡明了該方案的優(yōu)越性。關(guān)鍵詞: 單片機(jī), 精簡(jiǎn)指令集, 算術(shù)邏輯單元, 流水線 Abstract: Work principle for ALU in an 8_bit RISC Singlechip microcomputer is described. The traditional PIC scheme, 332 Pipeline scheme and 44 Pipeline scheme are compared on the base of the principle, which are implemented using Synopsys design tools. Results from synthesis and simulation shows that 44 scheme operates the fast, which is 43.9% faster and only 1.6% larger than 332 scheme. The essential reason why the performance is so different is analyzed.Then the advantage of 44 scheme is clarified.Key words: Singlechip, Microcomputer, RISC, ALU, Pipeline
上傳時(shí)間: 2013-10-18
上傳用戶:xiaoyaa
6位LED顯示接口說(shuō)明:P0.0---P0.7 通過(guò)7406 驅(qū)動(dòng)LED的8個(gè)段;P2.0---P2.5 通過(guò)UN2003驅(qū)動(dòng)6個(gè)LED 的公共端
標(biāo)簽: 8段數(shù)碼管 驅(qū)動(dòng)電路 C語(yǔ)言 驅(qū)動(dòng)程序
上傳時(shí)間: 2013-10-26
上傳用戶:VRMMO
該電路適合初學(xué)者使用,8乘8的LED點(diǎn)陣引腳示意圖及運(yùn)用。
上傳時(shí)間: 2014-12-28
上傳用戶:lxm
EDA課程設(shè)計(jì)8位十進(jìn)制乘法器。
上傳時(shí)間: 2013-10-17
上傳用戶:牛津鞋
8毫米波近程測(cè)距雷達(dá)設(shè)計(jì)
標(biāo)簽: 毫米波 測(cè)距雷達(dá)
上傳時(shí)間: 2014-12-29
上傳用戶:weareno2
AD9670支持醫(yī)療超聲應(yīng)用,專門針對(duì)低成本、低功耗、小尺寸及易用性而設(shè)計(jì)。它內(nèi)置8通道的可變?cè)鲆娣糯笃?VGA)、低噪聲前置放大器(LNA)、具有可編程相位旋轉(zhuǎn)功能的CW諧波抑制I/Q解調(diào)器、抗混疊濾波器(AAF)、模數(shù)轉(zhuǎn)換器(ADC)以及用于處理數(shù)據(jù)和降低帶寬的數(shù)字解調(diào)器和抽取器。
上傳時(shí)間: 2014-11-05
上傳用戶:lo25643
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