單片機(jī)外文翻譯--stc89c52處理芯片-展示頁(yè)
2024-11-13 04:55本頁(yè)面
【正文】 Mouth: P1 mouth P1 is an internal resistance of the eight twoway I/O buffers can drive, P1 output four TTL logic level. To write 1 P1 port, the internal resistance to port, can push as input mouth. When used as input, external and internal foot because of low resistance, will output current IIL . In addition, and respectively timer/counter 2 external counting input / T2 and when the trigger editor/counter input 2 , specific T2EX/are shown below. In programming and calibration, flash P1 mouth absorb eight address low byte. Efficacy: the foot. T2 timer/counter T2 external counting input , clock output T2EX timer/counter T2 capture/overloaded triggered signals and direction control , MOSI with online system programming, MISO with online system programming, SCK with online system programming, Mouth: P2 P2 mouth is an internal resistance of the eight twoway I/O buffers and P2 output can drive four TTL logic level. To write 1 P2 port, the internal resistance to port, can push as input mouth. When used as input, external and internal foot because of low resistance, will output current IIL . In the external program memory access or use 16bit external numerical memory address read for example MOVX execution DPTR , P2 mouth send out high 8 address. In this application, P2 mouth on the internal use strong pull send 1. In using 8bit address such as MOVX RI access to external numerical memory, P2 mouth output P2 latches content. In programming and calibration, flash P2 mouth also absorb high eight address byte and some control signal. P3: a P3 mouth on the inside of the eight twoway pullup resistors I/O buffers can drive, p2 output four TTL logic level. For P3 port to write 1, the internal resistance to port, can push as input mouth. When used as input, external and internal foot because of low resistance, wi
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