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SN250 bảng dữ liệu(PDF) 44 Page - STMicroelectronics

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SN250 bảng dữ liệu(HTML) 44 Page - STMicroelectronics

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Functional description—application modules
SN250
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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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