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TL16C752BTPTREP Datenblatt(PDF) 8 Page - Texas Instruments |
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TL16C752BTPTREP Datenblatt(HTML) 8 Page - Texas Instruments |
8 / 35 page TL16C752B-EP 3.3-V DUAL UART WITH 64-BYTE FIFO SGLS153 – FEBRUARY 2003 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 functional description (continued) TX Xoff1/2 characters are transmitted when the RX FIFO has passed the HALT trigger level programmed in TCR[3:0]. Xon1/2 characters are transmitted when the RX FIFO reaches the RESUME trigger level programmed in TCR[7:4]. An important note here is that if, after an xoff character has been sent and software flow control is disabled, the UART transmits Xon characters automatically to enable normal transmission to proceed. A feature of the TL16C752B-EP UART design is that if the software flow combination (EFR[3:0]) changes after an Xoff has been sent, the originally programmed Xon is automatically sent. If the RX FIFO is still above the trigger level, the newly programmed Xoff1/2 is transmitted. The transmission of Xoff/Xon(s) follows the exact same protocol as transmission of an ordinary byte from the FIFO. This means that even if the word length is set to be 5, 6, or 7 characters then the 5, 6, or 7 least significant bits of Xoff1,2/Xon1,2 is transmitted. (Note that the transmission of 5, 6, or 7 bits of a character is seldom done, but this functionality is included to maintain compatibility with earlier designs.) It is assumed that software flow control and hardware flow control are never enabled simultaneously. Figure 4 shows an example of software flow control. 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 Xoff-1 Word Xoff-2 Word Receive FIFO Data Xoff – Xon – Xoff Compare Programmed Xon–Xoff Characters UART 2 Xon-2 Word Figure 4. Software Flow Control Example |
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