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8位MCU升級(jí)至32位MCU的設(shè)計(jì)方案 目前的MCU市場(chǎng)分為三個(gè)部分， 8位、16位和32位內(nèi)核（4位內(nèi)核MCU現(xiàn)在已相當(dāng)少用，故在本次比較中將其忽略）。對(duì)于這三個(gè)部分中的每一個(gè)，其規(guī)模大體相同。傳統(tǒng)上8位內(nèi)核占最大的市場(chǎng)份額。根據(jù)一些分析人士報(bào)告，可能32位內(nèi)核市場(chǎng)占有率已經(jīng)超過(guò)了8位內(nèi)核。即使目前尚未超過(guò)，時(shí)間也不會(huì)太長(zhǎng)。32位內(nèi)核市場(chǎng)份額是迄今為止增長(zhǎng)最快的。8位內(nèi)核和16位內(nèi)核仍在增長(zhǎng)，但在速度方面遠(yuǎn)不如32位內(nèi)核（8位內(nèi)核的增長(zhǎng)速度仍快于16位內(nèi)核）在很長(zhǎng)的一段時(shí)間內(nèi)， 很多人相信16位MCU可能會(huì)被8位MCU和32位MCU取代。目前的32位MCU器件采用最新技術(shù)制造（與8位內(nèi)核和16為內(nèi)核相比）。
標(biāo)簽： MCU 8位 設(shè)計(jì)方案
上傳時(shí)間： 2014-01-21
上傳用戶：13033095779
The PCA9534 is a 16-pin CMOS device that provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, 400 kHz clock frequency, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.
上傳時(shí)間： 2013-11-17
上傳用戶：vodssv
NEC 8位MCU參考手冊(cè)
上傳時(shí)間： 2013-11-17
上傳用戶：swz13842860183
PCA9634是一款通過(guò)I2C總線控制的8位LED驅(qū)動(dòng)器，該驅(qū)動(dòng)器特別為紅/綠/藍(lán)/琥珀（RGBA）色的混合應(yīng)用進(jìn)行了優(yōu)化。每個(gè)LED輸出都有自己的8位分辨率（256級(jí)）固定頻率的獨(dú)立PWM控制器，該控制器運(yùn)行在97KHz的頻率下，占空比可由0%到99.6%可調(diào)，用以將LED設(shè)置到一個(gè)特定的亮度值。除此之外，該驅(qū)動(dòng)器還有一個(gè)8位分辨率（256級(jí)）的組PWM控制器，該控制器的工作頻率可以為固定的190Hz，也可以在24Hz和每10.73秒一次（約0.093Hz）之間調(diào)整，其占空比為0%到99.6%可調(diào)，用于使所有LED以同樣的值模糊（dim）或者閃爍。
上傳時(shí)間： 2013-12-20
上傳用戶：liaofamous
PCA9624是一款帶I2C總線的8位LED的電壓開(kāi)關(guān)優(yōu)化的LED驅(qū)動(dòng)器，它主要應(yīng)用于電流為100mA 的紅/綠/藍(lán)/琥珀（RGBA）的LED的亮度和閃爍的控制。每個(gè)LED輸出均有獨(dú)立的8位分辨率（256個(gè)梯度）且輸出頻率固定為97KHz的PWM控制器它可以在0%到99.6%的范圍內(nèi)對(duì)LED的亮度進(jìn)行調(diào)整，使發(fā)光二極管被設(shè)置為一個(gè)特定的亮度值。額外的8位分辨率（256個(gè)梯度）PWM控制器組既有固定的190Hz的頻率又可以在24Hz和每10.73秒的固定周期內(nèi)對(duì)LED燈亮度從0％至99.6％的范圍內(nèi)調(diào)整，使它們保持同樣的亮度或閃爍速度。
上傳時(shí)間： 2013-11-24
上傳用戶：38553903210
PCA9624是一款帶I2C總線的8位LED的電壓開(kāi)關(guān)優(yōu)化的LED驅(qū)動(dòng)器，它主要應(yīng)用于電流為100mA 的紅/綠/藍(lán)/琥珀（RGBA）的LED的亮度和閃爍的控制。每個(gè)LED輸出均有獨(dú)立的8位分辨率（256個(gè)梯度）且輸出頻率固定為97KHz的PWM控制器它可以在0%到99.6%的范圍內(nèi)對(duì)LED的亮度進(jìn)行調(diào)整，使發(fā)光二極管被設(shè)置為一個(gè)特定的亮度值。額外的8位分辨率（256個(gè)梯度）PWM控制器組既有固定的190Hz的頻率又可以在24Hz和每10.73秒的固定周期內(nèi)對(duì)LED燈亮度從0％至99.6％的范圍內(nèi)調(diào)整，使它們保持同樣的亮度或閃爍速度。
上傳時(shí)間： 2014-12-27
上傳用戶：zhangliming420
<Almost since the introduction of microcontrollers as electronic components there always has been an oscillatorcircuit on the device to make it work. From application point of view only some external components wererequired to make it work. However, to make sure that it will always work required more effort. This report is basedon feedback from the market from customers applying 8-bit mircrocontrollers.>
標(biāo)簽： oscillators X-tal bit mic
上傳時(shí)間： 2013-11-12
上傳用戶：穿著衣服的大衛(wèi)
The PCA9670 provides general purpose remote I/O expansion for most microcontrollerfamilies via the two-line bidirectional bus (I2C-bus) and is a part of the Fast-mode Plusfamily.The PCA9670 is a drop-in upgrade for the PCF8574 providing higher Fast-mode Plus(Fm+) I2C-bus speeds (1 MHz versus 400 kHz) so that the output can support PWMdimming of LEDs, higher I2C-bus drive (30 mA versus 3 mA) so that many more devicescan be on the bus without the need for bus buffers, higher total package sink capacity(200 mA versus 100 mA) that supports having all 25 mA LEDs on at the same time andmore device addresses (64 versus 8) are available to allow many more devices on the buswithout address conflicts.
標(biāo)簽： Remote expand 9670 PCA
上傳時(shí)間： 2013-10-15
上傳用戶：stella2015
The PCA9672 provides general purpose remote I/O expansion for most microcontrollerfamilies via the two-line bidirectional bus (I2C-bus) and is a part of the Fast-mode Plusfamily.The PCA9672 is a drop-in upgrade for the PCF8574 providing higher Fast-mode Plus(Fm+) I2C-bus speeds (1 MHz versus 400 kHz) so that the output can support PWMdimming of LEDs, higher I2C-bus drive (30 mA versus 3 mA) so that many more devicescan be on the bus without the need for bus buffers, higher total package sink capacity(200 mA versus 100 mA) that supports having all LEDs on at the same time and moredevice addresses (16 versus 8) are available to allow many more devices on the buswithout address conflicts.
標(biāo)簽： Remote expand 9672 PCA
上傳時(shí)間： 2013-10-23
上傳用戶：jasonheung
The PCA9674/74A is a drop-in upgrade for the PCF8574/74A providing higher Fast-modePlus I2C-bus speeds (1 MHz versus 400 kHz) so that the output can support PWMdimming of LEDs, higher I2C-bus drive (30 mA versus 3 mA) so that many more devicescan be on the bus without the need for bus buffers, higher total package sink capacity(200 mA versus 100 mA) that supports having all LEDs on at the same time and moredevice addresses (64 versus 8) are available to allow many more devices on the buswithout address conflicts.
標(biāo)簽： 9674 PCA Remote 9674A
上傳時(shí)間： 2013-10-22
上傳用戶：wwwwwen5
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