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UPD17708 데이터시트(PDF) 116 Page - NEC

부품명 UPD17708
상세설명  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM
PDF  356 Pages
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제조업체  NEC [NEC]
홈페이지  http://www.nec.com/
Logo NEC - NEC

UPD17708 데이터시트(HTML) 116 Page - NEC

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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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