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TL16C750E Datasheet(PDF) 33 Page - Texas Instruments |
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TL16C750E Datasheet(HTML) 33 Page - Texas Instruments |
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33 / 59 page  TX TXRDY TXRDY RXRDY RXRDY wrptr rdptr rdptr RX Trigger Level wrptr FIFO Empty At Least One Location Filled Trigger Level 33 TL16C750E www.ti.com SLLSF10 – DECEMBER 2019 Product Folder Links: TL16C750E Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Device Functional Modes (continued) Figure 29 shows TXRDY and RXRDY in DMA mode 1. Figure 29. TXRDY and RXRDY in DMA Mode 1 9.4.3 Sleep Mode Sleep mode is an enhanced feature of the TL16C750E UART. It is enabled when EFR[4], the enhanced functions bit, is set and when IER[4] is set. Sleep mode is entered when: • The serial data input line, RX, is idle (see Break and Timeout Conditions). • The TX FIFO and TX shift register are empty. • There are no interrupts pending except THR and timeout interrupts. Sleep mode is not entered if there is data in the RX FIFO. In sleep mode, the UART clock and baud rate clock are stopped. Because most registers are clocked using these clocks, the power consumption is greatly reduced. The UART wakes up when any change is detected on the RX line, when there is any change in the state of the modem input pins, or if data is written to the TX FIFO. NOTE Writing to the divisor latches, DLL and DLH, to set the baud clock, must not be done during sleep mode. Therefore, TI recommends to disable sleep mode using IER[4] before writing to DLL or DLH. |
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