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STV3550 数据表(PDF) 19 Page - STMicroelectronics |
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STV3550 数据表(HTML) 19 Page - STMicroelectronics |
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19 / 144 page  STV3550 Pin List STV3550 19/144 2.3 Parallel I/O Pins and Alternate Functions The STV3550 includes 30 Parallel I/O pins arranged in 4 banks of 6 to 8-bit ports. The pins can be programmable in input, output, bi-directional or as alternate function pins. The ports are listed in Table 3 on page 14. When configured as an output, the pin can be either open drain or with weak pull-up. The input to any pin can be compared to a stored value, and if not equal, can produce an interrupt. Any pin can be configured to output an alternate functions rather than programmed value. The input channel can be directly connected to a peripheral device to make the pin as a primary input of the device. The following table shows the assignments of the alternate functions for the 30 I/O pins. Table 7: Not Connected Pin No. Pin Name Pin Description 54 NC 101 NC 103 NC Figure 6: Pin Connections Alternate Alternate Clock I/O Pin Open Drain Input Latch Synchronizer 10 Push-Pull Output Function Data Output Register Alternate Input Output Latch STBus Interconnect |
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