電工電子類外文翻譯---芯片stc12c5204ad的io口配置(存儲(chǔ)版)
【正文】 裝置將其拉低。t need to reconfigure mouth lines output state. This is because juncture lines output is 1 drive ability is very weak, allowing external devices will its down. When pins for low, it output driving ability, can absorb the considerable current. Quasi twoway mouth have 3 pull_up transistor adapted to different needs. In the three and one transistor, pull up transistor called weak on pull , for 1 and paternal line registers itself pins for 1 open. This pull_up provides basic drive current make prospective twoway mouth for 1 output. If a pin for 1 and output by external devices to drop down to low, pull up close and weak very weak pull_up maintain open position, in order to put this pin for low, strong to pull the external devices must have enough power to make pin infused current threshold voltage of a voltage to the following. Article 2 pull_up transistors, called extremely weak on pull, 1 latch paternal line when open. When pin, the very weak suspended the pull_up source generates very weak and current will pin and high level. Article 3 pull_up transistor called powerful pull. Juncture line latches from 0 to 1, the jumping to accelerate must pull up by logic 0 to twoway mouth logic 1 conversion. When this happened, powerful pull open about 2 machine cycle to make pins can quickly pull to the earth high level. Quasi twoway mouth output shown below. STC12C520 series microcontroller 3V device, if the user is in pins plus 5V voltage, there will be a current flow from pins, this has caused additional VDD power consumption. Accordingly, the proposal is not in quasi twoway mouth mode 3V microcontroller pins to exert 5V voltage, such as the use of words, will add current limiting resistor, or using diode do input isolation, or use triode do output segregation. Quasi twoway mouth with a schmidt trigger input and a interference suppression circuit. 2. The pushpull output configuration The dropdown pushpull output configuration opendrain output and the structure and the prospective twoway mouth down same structure, but when latches is 1 provides continuous strong pull up. The pushpull model need more monly used for driving current situation. The pushpull pins configuration are shown below. 3. Only for input (high resistance) configuration Input port configuration are shown below. Input port with a schmidt trigger input and a interference suppression
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