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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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7721 датащи(PDF) 243 Page - Renesas Technology Corp |
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7721 датащи(HTML) 243 Page - Renesas Technology Corp |
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243 / 577 page  SERIAL I/O 7721 Group User’s Manual 11–40 11.4 Clock asynchronous serial I/O (UART) mode The above timing diagram applies when the following conditions are satisfied: q Parity disabled q 2 stop bits q CTS function disabled D0 D1 D2 D3 D4 D5 D6 D7 ST D8 D0 D1 D2 D3 D4 D5 D6 D7 ST SP D0 D1 ST D8 SP SP SP Tc TENDi TxDi TENDi: Next transmit conditions are examined when this signal level is “H.” (TENDi is an internal signal. Accordingly, it cannot be read from the external.) Tc = 16(n + 1)/fi or 16(n + 1)/fEXT fi: BRGi count source frequency (f2, f16, f64, f512) fEXT: BRGi count source frequency (external clock) n: Value set in BRGi Transfer clock Transmit enable bit Transmit buffer empty flag Transmit register empty flag UARTi transmit interrupt request bit Data is set in UARTi transmit buffer register. Start bit Cleared to “0” when interrupt request is accepted or cleared by software. UARTi transmit register UARTi transmit buffer register Stopped because transmit enable bit = “0” Stop bit Stop bit Fig. 11.4.8 Example of transmit timing when transfer data length = 9 bits (when parity disabled, ____ selecting 2 stop bits, not selecting CTS function) |
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