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TL16C550CIPTG4 데이터시트(PDF) 4 Page - Texas Instruments |
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TL16C550CIPTG4 데이터시트(HTML) 4 Page - Texas Instruments |
4 / 43 page TL16C550C, TL16C550CI ASYNCHRONOUS COMMUNICATIONS ELEMENT WITH AUTOFLOW CONTROL SLLS177H − MARCH 1994 − REVISED JANUARY 2006 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 auto-CTS and auto-RTS functional timing Start Bits 0 − 7 Start Bits 0 − 7 Start Bits 0 − 7 Stop Stop Stop SOUT CTS NOTES: A. When CTS is low, the transmitter keeps sending serial data out. B. If CTS goes high before the middle of the last stop bit of the current byte, the transmitter finishes sending the current byte but it does not send the next byte. C. When CTS goes from high to low, the transmitter begins sending data again. Figure 2. CTS Functional Timing Waveforms The receiver FIFO trigger level can be set to 1, 4, 8, or 14 bytes. These are described in Figures 3 and 4. Start Byte N Start Byte N+1 Start Byte Stop Stop Stop SIN RTS RD (RD RBR) 12 N N+1 NOTES: A. N = RCV FIFO trigger level (1, 4, or 8 bytes) B. The two blocks in dashed lines cover the case where an additional byte is sent as described in the preceding auto-RTS section. Figure 3. RTS Functional Timing Waveforms, RCV FIFO Trigger Level = 1,4, or 8 Bytes Byte 14 Byte 15 SIN RTS RD (RD RBR) Start Byte 18 Stop Start Byte 16 Stop RTS Released After the First Data Bit of Byte 16 NOTES: A. RTS is deasserted when the receiver receives the first data bit of the sixteenth byte. The receive FIFO is full after finishing the sixteenth byte. B. RTS is asserted again when there is at least one byte of space available and no incoming byte is in processing or there is more than one byte of space available. C. When the receive FIFO is full, the first receive buffer register read reasserts RTS. Figure 4. RTS Functional Timing Waveforms, RCV FIFO Trigger Level = 14 Bytes |
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