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SM59264C40 Datasheet(PDF) 11 Page - SyncMOS Technologies,Inc |
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SM59264C40 Datasheet(HTML) 11 Page - SyncMOS Technologies,Inc |
11 / 36 page SyncMOS Technologies International, Inc. SM59264 8-Bits Micro-controller with 128KB flash & 1KB RAM & TWSI & SPWM embedded Specifications subject to change without notice contact your sales representatives for the most recent information. Ver 2.1 SM59264 08/2006 11 1.4 I/O Pin Configuration The ports 1, 2 and 3 of standard 8051 have internal pull-up resistor, and port 0 has open-drain outputs. Each I/O pin can be used independently as an input or an output. For I/O ports to be used as an input pin, the port bit latch must contain a ‘1’ which turns off the output driver FET. Then for port 1, 2 and 3 port pin is pulled high by a weak internal pull-up, and can be pulled low by an external source. The port 0 has open-drain outputs which means its pull-ups are not active during normal port operation. Writing ‘1’ to the port 0 bit latch will causing bit floating so that it can be used as a high-impedance input. The port 4 used as GPIO will has the same function as port 1, 2 and 3. |
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