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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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M58-ZC Fiches technique(PDF) 38 Page - Nuvoton Technology Corporation |
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M58-ZC Fiches technique(HTML) 38 Page - Nuvoton Technology Corporation |
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38 / 71 page  NuMicro ™ M058/M0516BN Datasheet Publication Release Date: Mar. 19, 2012 - 38 - Revision V1.01 6.4.1.3 Open-Drain Mode Explanation Set Px_PMD (PMDn[1:0]) to 2’b10 the Px[n] pin is in Open-Drain mode and the I/O pin supports digital output function but only with sink current capability, an additional pull-up resister is needed for driving high state. If the bit value in the corresponding bit [n] of Px_DOUT is “0”, the pin drive a “low” output on the pin. If the bit value in the corresponding bit [n] of Px_DOUT is “1”, the pin output drives high that is controlled by the internal pull-up resistor or the external pull high resistor. Port Pin Port Latch Data N Input Data Figure 6-11 Open-Drain Output 6.4.1.4 Quasi-bidirectional Mode Explanation Set Px_PMD (PMDn[1:0]) to 2’b11 the Px[n] pin is in Quasi-bidirectional mode and the I/O pin supports digital output and input function at the same time but the source current is only up to hundreds uA. Before the digital input function is performed the corresponding bit in Px_DOUT must be set to 1. The quasi-bidirectional output is common on the 80C51 and most of its derivatives. If the bit value in the corresponding bit [n] of Px_DOUT is “0”, the pin drive a “low” output on the pin. If the bit value in the corresponding bit [n] of Px_DOUT is “1”, the pin will check the pin value. If pin value is high, no action takes. If pin state is low, then pin will drive strong high with 2 clock cycles on the pin and then disable the strong output drive and then the pin status is control by internal pull-up resistor. Note that the source current capability in quasi-bidirectional mode is only about 200uA to 30uA for VDD is form 5.0V to 2.5V Port Pin 2 CPU Clock Delay Input Data Port Latch Data P P P N VDD Strong Very Weak Weak |
Numéro de pièce similaire - M58-ZC |
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Description similaire - M58-ZC |
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