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UPD17015 Datasheet(PDF) 39 Page - NEC |
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UPD17015 Datasheet(HTML) 39 Page - NEC |
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39 / 120 page  39 µPD17015 9.3.2 Using the Input Port To read the input data, execute an instruction to read the contents of port register P0B (such as SKT). If the signal input to a pin is high, 1 is read from the corresponding port register. If the input signal is low, 0 is read from the port register. If a write instruction (such as MOV) is executed for a port register, nothing changes. 9.3.3 Notes on Using the Input Port P0B is internally pulled down. 9.3.4 Statuses of the Input Port upon Reset (1) At power-on reset All pins are set to input mode. (2) At CE reset All pins are set to input mode. (3) At a clock-stop All pins are set to input mode. (4) In the halt state The previous statuses are retained. 9.4 GENERAL-PURPOSE OUTPUT PORTS (P0A2, P0A3, P0C0 to P0C3, and P0D0 pins) 9.4.1 Configurations of the Output Ports The configurations of the output ports are shown below. • P0A (P0A2 and P0A3 pins), P0C (P0C0 to P0C3 pins), P0D (P0D0 pin) VDD VDD Output latch Write instruction Port register (1 bit) Read instruction |
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