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SN250 数据表(PDF) 44 Page - STMicroelectronics |
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SN250 数据表(HTML) 44 Page - STMicroelectronics |
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44 / 130 page  Functional description—application modules SN250 44/130 7.2 Serial controller SC1 The SN250 SC1 module provides asynchronous (UART) or synchronous (SPI or I2C) serial communications. Figure 6 is a block diagram of the SC1 module. Figure 6. SC1 block diagram The full-duplex interface of the SC1 module can be configured into one of these three communication modes, but it cannot run them simultaneously. To reduce the interrupt service requirements of the CPU, the SC1 module contains buffered data management schemes for the three modes. A dedicated, buffered DMA controller is available to the SPI and UART controllers while a FIFO is available to all three modes. In addition, a SC1 data register allows the software application direct access to the SC1 data within all three modes. Finally, the SC1 routes the interface signals to GPIO pins. These are shared with other functions and are controlled by the GPIO_CFG register. For selecting alternate pin functions, please refer to Table 17 and Table 18. |
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