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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DOC7707 датащи(PDF) 164 Page - List of Unclassifed Manufacturers |
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DOC7707 датащи(HTML) 164 Page - List of Unclassifed Manufacturers |
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164 / 307 page  164 7707F–AVR–11/10 AT90USB82/162 stop sending characters. RTS usage and so associated flow control is enabled using RTSEN bit in UCSRnD. Figure 17-8. shows a reception example. Figure 17-8. Reception Flow Control Waveform Example Figure 17-9. RTS behavior RTS will rise at 2/3 of the last received stop bit if the receive fifo is full. To ensure reliable transmissions, even after a RTS rise, an extra-data can still be received and stored in the Receive Shift Register. 17.9.2 Transmission Flow Control The transmission flow can be controlled by hardware using the CTS pin controlled by the exter- nal receiver. The aim of the flow control is to stop transmission when the receiver is full of data (CTS = 1). CTS usage and so associated flow control is enabled using CTSEN bit in UCSRnD. The CTS pin is sampled at each CPU write and at the middle of the last stop bit that is curently being sent. Figure 17-10. CTS behavior RTS RXD C1 C2 0 1 2 FIFO 1 CPU Read Index C3 1 0 RTS RXD Start Byte0 Stop Start Byte1 Stop Read from CPU Start Byte2 1 additional byte may be sent if the transmitter misses the RTS trig CTS TXD Start Byte0 Stop Start Byte1 Stop Start Byte2 sample sample Write from CPU sample |
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