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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST72C254G2 데이터시트(PDF) 32 Page - STMicroelectronics |
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ST72C254G2 데이터시트(HTML) 32 Page - STMicroelectronics |
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32 / 135 page  ST72104G, ST72215G, ST72216G, ST72254G 32/135 I/O PORTS (Cont’d) Table 7. I/O Port Configurations Notes: 1. When the I/O port is in input configuration and the associated alternate function is enabled as an output, reading the DR register will read the alternate function output status. 2. When the I/O port is in output configuration and the associated alternate function is enabled as an input, the alternate function reads the pin status given by the DR register content. Hardware Configu ration CONDITION PAD VDD RPU EXTERNAL INTERRU PT POLARITY DATA BUS PULL-UP INTERRUPT DR REGISTER ACCESS W R FROM OTHER PINS SOURCE (eix) SELECTI ON DR REGISTER CONDITIO N ALTERNATE INPUT NOT IMPLEMENTED IN TRUE OPEN DRAIN I/O PORTS ANALOG INPUT PAD RPU DATA BUS DR DR REGIST ER ACCESS R/W VDD ALTERNATE ALTERNATE ENAB LE OUTPUT REGIST ER NOT IMPLEMENTED IN TRUE OPEN DRAIN I/O PORTS PAD RPU DATA BUS DR DR REGIST ER ACCESS R/W VDD ALTERNATE ALTERNATE ENAB LE OUTPUT REGIST ER NOT IMPLEMENTED IN TRUE OPEN DRAIN I/O PORTS |
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