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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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STC89LE53RC Datenblatt(PDF) 30 Page - STCmicro Technology Co,.Ltd |
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STC89LE53RC Datenblatt(HTML) 30 Page - STCmicro Technology Co,.Ltd |
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30 / 165 page  4.4 Open-drain Output The open-drain output configuration turns off all pull-ups and only drives the pull-down transistor of the port pin when the port register contains a logic “0”. To use this configuration in application, a port pin must have an external pull-up, typically tied to VCC. The pull-down for this mode is the same as for the quasi-bidirectional mode. T he input path of the port pin in this configuration is the same as quasi- bidirection mode. PORT PIN PORT LATCH DATA INPUT DATA Open-drain output 4.3 Input-only Mode The input-only configuration is a Schmitt-triggered input without any pull-up resistors on the pin. PORT PIN INPUT DATA Input-only Mode 4.2 Push-pull Output The push-pull output configuration has the same pull-down structure as both the open-drain and the quasi- bidirectional output modes, but provides a continuous strong pull-up when the port register conatins a logic “1”. The push-pull mode may be used when more source current is needed from a port output. In addition, input path of the port pin in this configuration is also the same as quasi-bidirectional mode. Vcc PORT PIN PORT LATCH DATA INPUT DATA Push-pull output 30 |
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