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UPD17708 Datasheet(PDF) 116 Page - NEC |
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UPD17708 Datasheet(HTML) 116 Page - NEC |
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116 / 356 page  µPD17704, 17705, 17707, 17708, 17709 116 11.4 General-Purpose Output Port (P1B) 11.4.1 Configuration of output port The configuration of the output port is shown below. (1) P1B (P1B3, P1B2, P1B1, P1B0) 11.4.2 Using output port The output port outputs the contents of the output latch to each pin. The output data is set by executing a write instruction (such as MOV) to the port register corresponding to the port pin. Write “1” to the port register to output a high level to the port pin; write “0” to output a low level. However, because P1B is an N-ch open-drain output port, it is floated when it outputs a high level. Therefore, an external pull-up resistor must be connected to this port. If a read instruction (such as SKT) is executed to the port register, the contents of the output latch are read. 11.4.3 Status of output port at reset (1) At power-ON reset The contents of the output latch are output. The contents of the output latch are reset to “0”. (2) At WDT&SP reset The contents of the output latch are output. The contents of the output latch are reset to “0”. (3) At CE reset The contents of the output latch are output. The contents of the output latch are retained. (4) On execution of clock stop instruction The contents of the output latch are output. The contents of the output latch are retained. (5) In halt status The contents of the output latch are output. The contents of the output latch are retained. Output latch Read instruction Port register (1 bit) Write instruction |
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