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ST7232A 数据表(PDF) 44 Page - STMicroelectronics |
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ST7232A 数据表(HTML) 44 Page - STMicroelectronics |
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44 / 157 page  ST7232A 44/157 I/O PORTS (Cont’d) Table 11. 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 Configuration CONDITION PAD VDD RPU EXTERNAL INTERRUPT DATA BUS PULL-UP INTERRUPT DR REGISTER ACCESS W R SOURCE (eix) DR REGISTER CONDITION ALTERNATE INPUT NOT IMPLEMENTED IN TRUE OPEN DRAIN I/O PORTS ANALOG INPUT PAD RPU DATA BUS DR DR REGISTER ACCESS R/W VDD ALTERNATE ALTERNATE ENABLE OUTPUT REGISTER NOT IMPLEMENTED IN TRUE OPEN DRAIN I/O PORTS PAD RPU DATA BUS DR DR REGISTER ACCESS R/W VDD ALTERNATE ALTERNATE ENABLE OUTPUT REGISTER NOT IMPLEMENTED IN TRUE OPEN DRAIN I/O PORTS 1 |
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