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STPM32 Datasheet(PDF) 66 Page - STMicroelectronics |
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STPM32 Datasheet(HTML) 66 Page - STMicroelectronics |
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66 / 121 page  Theory of operation STPM32, STPM33, STPM34 66/121 DS10272 Rev 8 Figure 47. Startup interface selection timing After the selected communication interface is established, the interface is locked to prevent the communication method from changes, and SCS pin is used as chip-select for the device. Pins used by the serial communication peripheral are listed in Table 23. Table 23. Communication pin description Name Function SPI connection UART connection SYN Synchronization GPIO (optional), VCC at startup GPIO (optional), VCC at startup SCS Chip-select -Start-up interface selection at GND -Chip-select at GND -Start-up interface selection at VCC -Chip-select at VCC SCL Clock SPI CLK Not used MOSI/RXD Data in SPI MOSI UART RX MISO/TXD Data out SPI MISO UART TX |
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