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SM89516A 데이터시트(PDF) 8 Page - SyncMOS Technologies,Inc |
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SM89516A 데이터시트(HTML) 8 Page - SyncMOS Technologies,Inc |
8 / 22 page SyncMOS Technologies International, Inc. SM89516A 8-Bits Micro-controller With 64KB flash & 1KB RAM embedded Specifications subject to change without notice contact your sales representatives for the most recent information. Ver 2.1 SM89516A 08/2006 8 1.3 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. 2. Port 4 for PLCC or QFP package : The bit addressable port 4 is available with PLCC or QFP package. The port 4 has only 4 pins and its port address is located at 0D8H. The function of port 4 is the same as the function of port 1, port 2 and port 3. Port4 (P4, $D8) bit-7 bit-0 Unused Unused Unused Unused P4.3 P4.2 P4.1 P4.0 Read / Write: - - - - R/W R/W R/W R/W Reset value: * * * * 1 1 1 1 The bit 3, bit 2, bit 1, bit 0 output the setting to pin P4.3, P4.2, P4.1, P4.0 respectively. The port 4 output buffers can sink 20mA and can drive LED display directly. |
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