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UM0932 数据表(PDF) 13 Page - STMicroelectronics |
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UM0932 数据表(HTML) 13 Page - STMicroelectronics |
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13 / 43 page  DocID17385 Rev 3 13/43 UM0932 Host interface 43 3 Host interface The host interface is a communication port used by the external host to exchange data with the ST7580 device. The host interface consists of a local port (a standard UART), a communication protocol and a set of commands exchanged between ST7580 and the external host. It manages the communication and arbitration on the local port, and provides access to ST7580 internal services. 3.1 UART The local communication is a half duplex asynchronous serial link (UART) using a receiving input (RXD), a transmitting output (TXD) and a T_REQ signal to manage the communication. The connection diagram of the ST7580 using UART as host interface port is shown in Figure 5. Figure 6. ST7580 and external host: UART connections The communication baud rate is selected after the ST7580 reset, in accordance with the status of local input ports BR0, BR1 listed in Table 5: Table 5. UART baud rate BR1 BR0 Baudrate (b/s) 0 0 9600 0 1 19200 1 0 38400 1 1 57600 |
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