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STR720 数据表(PDF) 345 Page - STMicroelectronics |
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STR720 数据表(HTML) 345 Page - STMicroelectronics |
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345 / 401 page  STR720 - GENERAL PURPOSE I/O PORTS 345/401 23.3.1 Input Configuration When the IO Port is programmed as Input: ■ The Output Buffer is forced tristate ■ The data present on the IO pin is sampled into the Input Latch every clock cycle ■ A reading access to the Data register gets the value in the Input Latch. The Figure 63 on page 345 shows the Input Configuration of the IO Port bit. 23.3.2 Bidirectional Configuration When the IO Port is programmed as Bidirectional: ■ The Output Buffer is turned on in Weak Pull configuration (Port2) ■ The Output Buffer is turned on in Weak Push configuration (Port3, Port4) ■ A reading access to the IO Data register gets the Input Latch value. Figure 63. Input Configuration I/O PIN Alternate Function (OUT) Alternate Function (IN) Tristate CMOS |
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