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TL16C754BPN Datasheet(PDF) 10 Page - Texas Instruments |
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TL16C754BPN Datasheet(HTML) 10 Page - Texas Instruments |
10 / 37 page TL16C754B QUAD UART WITH 64-BYTE FIFO SLLS397 – NOVEMBER 1999 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 functional description (continued) reset Table 2 summarizes the state of registers after reset. Table 2. Register Reset Functions REGISTER RESET CONTROL RESET STATE Interrupt enable register RESET All bits cleared Interrupt identification register RESET Bit 0 is set. All other bits cleared. FIFO control register RESET All bits cleared Line control register RESET Reset to 00011101 (1D hex). Modem control register RESET Bit 6–0 cleared. Bit 7 reflects the inverse of the CLKSEL pin value. Line status register RESET Bits 5 and 6 set. All other bits cleared. Modem status register RESET Bits 0–3 cleared. Bits 4–7 input signals. Enhanced feature register RESET Bit 6 – 0 is cleared. Bit 7 reflects the inverse of the CLKSEL pin value. Receiver holding register RESET Pointer logic cleared Transmitter holding register RESET Pointer logic cleared Transmission control register RESET All bits cleared Trigger level register RESET All bits cleared NOTE: Registers DLL, DLH, SPR, Xon1, Xon2, Xoff1, Xoff2 are not reset by the top-level reset signal RESET, i.e., they hold their initialization values during reset. Table 3 summarizes the state of some signals after reset. Table 3. Signal Reset Functions SIGNAL RESET CONTROL RESET STATE TX RESET High RTS RESET High DTR RESET High RXRDY RESET High TXRDY RESET Low interrupts The TL16C754B UART has interrupt generation and prioritization (6 prioritized levels of interrupts) capability. The interrupt enable register (IER) enables each of the 6 types of interrupts and the INT signal in response to an interrupt generation. The IER can also disable the interrupt system by clearing bits 0–3, 5–7. When an interrupt is generated, the interrupt identification register(IIR) indicates that an interrupt is pending and provides the type of interrupt through IIR[5–0]. Table 4 summarizes the interrupt control functions. |
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