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SC16C752BIBS Datasheet(PDF) 11 Page - NXP Semiconductors |
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SC16C752BIBS Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 47 page Philips Semiconductors SC16C752B 5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs Product data Rev. 03 — 14 December 2004 11 of 47 9397 750 14443 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 6.3.3 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. UART 1 begins transmission and sends 52 characters, at which point UART2 will generate an interrupt to its processor to service the RCV FIFO, but assume the interrupt latency is fairly long. UART1 will continue sending characters until a total of 60 characters have been sent. At this time, UART2 will transmit 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 RX FIFO that the level drops to 32. UART2 will now send a 0D to UART1, informing UART1 to resume transmission. Fig 7. Software flow control example. TRANSMIT FIFO PARALLEL-TO-SERIAL SERIAL-TO-PARALLEL Xon-1 WORD Xon-2 WORD Xoff-1 WORD Xoff-2 WORD RECEIVE FIFO PARALLEL-TO-SERIAL SERIAL-TO-PARALLEL Xon-1 WORD Xon-2 WORD Xoff-1 WORD Xoff-2 WORD UART2 UART1 002aaa229 data Xoff–Xon–Xoff compare programmed Xon-Xoff characters |
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