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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC312XDP512F0MPVR датащи(PDF) 880 Page - Freescale Semiconductor, Inc |
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SC312XDP512F0MPVR датащи(HTML) 880 Page - Freescale Semiconductor, Inc |
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880 / 1348 page  Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2) MC9S12XDP512 Data Sheet, Rev. 2.21 882 Freescale Semiconductor 22.4.1.2 Input Register This is a read-only register and always returns the buffered state of the pin (Figure 22-76). 22.4.1.3 Data Direction Register This register defines whether the pin is used as an input or an output. If a peripheral module controls the pin the contents of the data direction register is ignored (Figure 22-76). Figure 22-76. Illustration of I/O Pin Functionality 22.4.1.4 Reduced Drive Register If the pin is used as an output this register allows the configuration of the drive strength. 22.4.1.5 Pull Device Enable Register This register turns on a pull-up or pull-down device. It becomes active only if the pin is used as an input or as a wired-OR output. 22.4.1.6 Polarity Select Register This register selects either a pull-up or pull-down device if enabled. It becomes active only if the pin is used as an input. A pull-up device can be activated if the pin is used as a wired-OR output. If the pin is used as an interrupt input this register selects the active interrupt edge. 22.4.1.7 Wired-OR Mode Register If the pin is used as an output this register turns off the active high drive. This allows wired-OR type connections of outputs. PT DDR output enable module enable 1 0 1 1 0 0 PIN PTI data out Module |
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