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TL16C752CRHBRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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TL16C752CRHBRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 52 page UART 1 Parallel to Serial Serial to Parallel Xon-1 Word Xon-2 Word Xoff-1 Word Xoff-1 Word Transmit FIFO Serial to Parallel Parallel to Serial Xon-1 Word Xon-2 Word Xoff-1 Word Xoff-2 Word Receive FIFO Data Xoff - Xon - Xoff Compare Programmed Xon- Xoff Characters UART 2 TL16C752C SLLS646A – MARCH 2008 – REVISED AUGUST 2009 .................................................................................................................................................... www.ti.com Figure 4. Software Flow Control Example Software Flow Control Example Assumptions: UART1 is transmitting a large text file to UART2. Both UARTs are using software flow control with single character Xoff (0F) and Xon (0D) tokens. Both have Xoff threshold (TCR [3:0]=F) set to 60 and Xon threshold (TCR[7:4]=8) set to 32. Both have the interrupt receive threshold (TLR[7:4]=D) set to 52. UART1 begins transmission and sends 52 characters, at which point UART2 generates an interrupt to its processor to service the RCV FIFO, but assumes the interrupt latency is fairly long. UART1 continues sending characters until a total of 60 characters have been sent. At this time UART2 transmits a 0F to UART1, informing UART1 to halt transmission. UART1 will likely send the 61st character while UART2 is sending the Xoff character. Now UART2 is serviced and the processor reads enough data out of the RCV FIFO that the level drops to 32. UART2 now sends a 0D to UART1, informing UART1 to resume transmission. Reset Table 2 summarizes the state of outputs after reset. 10 Submit Documentation Feedback Copyright © 2008–2009, Texas Instruments Incorporated Product Folder Link(s): TL16C752C |
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