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SC16C754IA68 Datasheet(PDF) 9 Page - NXP Semiconductors |
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SC16C754IA68 Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 49 page Philips Semiconductors SC16C754 Quad UART with 64-byte FIFO Product data Rev. 04 — 19 June 2003 9 of 49 9397 750 11618 © Koninklijke Philips Electronics N.V. 2003. All rights reserved. With Auto-CTS, CTS must be active before the UART can transmit data. Auto-RTS only activates the RTS output when there is enough room in the FIFO to receive data and de-activates the RTS output when the RX FIFO is sufficiently full. The halt and resume trigger levels in the TCR determine the levels at which RTS is activated/deactivated. If both Auto-CTS and Auto-RTS are enabled, when RTS is connected to CTS, data transmission does not occur unless the receiver FIFO has empty space. Thus, overrun errors are eliminated during hardware flow control. If not enabled, overrun errors occur if the transmit data rate exceeds the receive FIFO servicing latency. 6.2.1 Auto-RTS Auto-RTS data flow control originates in the receiver block (see Figure 1 “Block diagram.” on page 3). Figure 5 shows RTS functional timing. The receiver FIFO trigger levels used in Auto-RTS are stored in the TCR. RTS is active if the RX FIFO level is below the halt trigger level in TCR[3:0]. When the receiver FIFO halt trigger level is reached, RTS is deasserted. The sending device (e.g., another UART) may send an additional byte after the trigger level is reached (assuming the sending UART has another byte to send) because it may not recognize the deassertion of RTS until it has begun sending the additional byte. RTS is automatically reasserted once the receiver FIFO reaches the resume trigger level programmed via TCR[7:4]. This reassertion allows the sending device to resume transmission. Fig 4. Autoflow control (Auto-RTS and Auto-CTS) example. RX FIFO SERIAL-TO- PARALLEL FLOW CONTROL TX FIFO PARALLEL- TO-SERIAL FLOW CONTROL PARALLEL- TO-SERIAL FLOW CONTROL SERIAL-TO- PARALLEL FLOW TX FIFO RX FIFO UART 1 UART 2 D7-D0 RX TX RTS CTS TX RX CTS RTS D7-D0 CONTROL 002aaa228 |
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