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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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UM0934 데이터시트(PDF) 36 Page - STMicroelectronics |
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UM0934 데이터시트(HTML) 36 Page - STMicroelectronics |
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36 / 113 page  Host interface UM0934 36/113 Doc ID 17389 Rev 2 5 Host interface The host interface is a communication port used by the external host to exchange data with the ST7570. The host interface consists of a local port (a standard UART), a communication protocol, and a set of commands exchanged between ST7570 and the external host. It manages the communication and arbitration on the local port, and provides access to all the ST7570 internal services. 5.1 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 ST7570 using UART as the host interface port is shown in Figure 13 : Figure 13. ST7570 and external host: UART connections The communication baud rate is selected after the ST7570 reset, in accordance with the status of local input ports BR0 and BR1 listed in Table 9: Table 9. UART baud rate BR1 BR0 Baud rate (b/s) 0 0 9600 0 1 19200 1 0 38400 1 1 57600 UART Local Port TXD RXD T_REQ BR1 BR0 External UART Baudrate selection |
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