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7721 Datasheet(PDF) 205 Page - Renesas Technology Corp |
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7721 Datasheet(HTML) 205 Page - Renesas Technology Corp |
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205 / 577 page  SERIAL I/O 7721 Group User’s Manual 11–2 11.1 Overview Serial I/O consists of 2 channels: UART0 and UART1. They each have a transfer clock generating timer for the exclusive use of them and can operate independently. UART0 and UART1 have the same functions. UARTi (i = 0 and 1) has the following 2 operating modes: (1) Clock synchronous serial I/O mode Transmitter and receiver use the same clock as the transfer clock. Transfer data has a length of 8 bits. (2) Clock asynchronous serial I/O (UART) mode Transfer rate and transfer data format can arbitrarily be set. The user can select a transfer data length of 7 bits, 8 bits, or 9 bits. Figure 11.1.1 shows the transfer data formats in each operating mode. 11.1 Overview qClock synchronous serial I/O mode Transfer data length of 8 bits qUART mode Transfer data length of 7 bits Transfer data length of 8 bits Transfer data length of 9 bits Fig. 11.1.1 Transfer data formats in each operating mode |
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