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CHAPTER 4 I/O PORT
4.3.2
Operation of Port 1
The operation of port 1 is explained.
■
Operation of Port 1 (in Single Chip Mode)
●
Operation of output port
•
When the bit in the port 1 direction register (DDR1) corresponding to the output pin is set to "1", port 0
functions as an output port.
•
When the output buffer is turned "ON" and output data is written to the port 1 data register (PDR1), the
data is retained in the output latch and output from the pin.
•
When the PDR1 is read, the state of the output latch in the PDR1 is read.
●
Operation of input port
•
If the bit in the DDR corresponding to the input pin is set to "0", port 1 functions as an input port.
•
The output buffer is turned "OFF" and the pin enters the high impedance state.
•
When data is written to the PDR1, it is retained in the output latch in the PDR1 but not output to the pin.
•
When the PDR1 is read, the level value (Low or High) of the pin is read.
●
Operation of resource output
•
When using the port as the output pin of the resource, set the resource output to enabled.
•
Since the resource output is preferred enabled, the resource output functions regardless of the settings of
the DDR1.
•
When the pin state is read with the resource output set to enabled, the output state of the resource is
read.
●
Operation of resource input
•
The state of the pin that serves as the resource input is input to the resource.
•
When using port 1 as the input pin of the resource, clear the bit in the DDR1 corresponding to the input
pin of the resource to 0 and set the input pin as an input port.
●
Operation at reset
•
When the CPU is reset, the value of the DDR1 is cleared to "0".Consequently, all output buffers are set
to "OFF" (the pin becomes an input port pin), and the pin enters the high-impedance state.
•
The PDR1 is not initialized by reset. Therefore, when using port 1 as an output port, it is necessary to set
output data in the PDR1, and then set the bit in the DDR1 corresponding to the output pin to 1, and then,
to output.
Note:
If read modify write instructions (such as the bit set instruction) are used to read the PDR, the
pin set as an output port by the DDR outputs the desired data. To switch a pin from input port
to output port, write output data to the port data register and use the port direction register to
set the pin as an output port.
Содержание F2MC-16LX Series
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Страница 3: ...FUJITSU LIMITED F2MC 16LX 16 bit Microcontroller MB90895 series Hardware Manual ...
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Страница 676: ...658 APPENDIX Table A 9 3 Bit Operation Instruction Map first byte 6CH ...
Страница 677: ...659 APPENDIX A Instructions Table A 9 4 Character String Operation Instruction Map first byte 6EH ...
Страница 678: ...660 APPENDIX Table A 9 5 2 byte Instruction Map first byte 6FH MUL MULW DIVU A A A ...
Страница 680: ...662 APPENDIX Table A 9 7 ea Instruction 2 first byte 71H ...
Страница 681: ...663 APPENDIX A Instructions Table A 9 8 ea Instruction 3 first byte 72H ...
Страница 682: ...664 APPENDIX Table A 9 9 ea Instruction 4 first byte 73H ...
Страница 683: ...665 APPENDIX A Instructions Table A 9 10 ea Instruction 5 first byte 74H ...
Страница 684: ...666 APPENDIX Table A 9 11 ea Instruction 6 first byte 75H ...
Страница 685: ...667 APPENDIX A Instructions Table A 9 12 ea Instruction 7 first byte 76H ...
Страница 686: ...668 APPENDIX Table A 9 13 ea Instruction 8 first byte 77H ...
Страница 687: ...669 APPENDIX A Instructions Table A 9 14 ea Instruction 9 first byte 78H ...
Страница 688: ...670 APPENDIX Table A 9 15 MOVEA RWi ea Instruction first byte 79H ...
Страница 689: ...671 APPENDIX A Instructions Table A 9 16 MOV Ri ea Instruction first byte 7AH ...
Страница 690: ...672 APPENDIX Table A 9 17 MOVW RWi ea Instruction first byte 7BH ...
Страница 691: ...673 APPENDIX A Instructions Table A 9 18 MOV ea Ri Instruction first byte 7CH ...
Страница 692: ...674 APPENDIX Table A 9 19 MOVW ea Rwi Instruction first byte 7DH ...
Страница 693: ...675 APPENDIX A Instructions Table A 9 20 XCH Ri ea Instruction first byte 7EH ...
Страница 694: ...676 APPENDIX Table A 9 21 XCHW RWi ea Instruction first byte 7FH ...
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