SC16C550 datasheet(11/52 Pages) PHILIPS

Part #	SC16C550

Description	Universal Asynchronous Receiver/Transmitter (UART) with 16-byte FIFO and infrared (IrDA) encoder/decoder

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Manufacturer	PHILIPS [NXP Semiconductors]

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11 / 52 page

Philips Semiconductors

SC16C550

UART with 16-byte FIFO and IrDA encoder/decoder

Product data

Rev. 05 — 19 June 2003

11 of 52

9397 750 11619

6.3 Autoﬂow control (see Figure 5)

Autoﬂow control is comprised of auto-CTS and auto-RTS. With auto-CTS, the CTS

input must be active before the transmitter FIFO can emit data. With auto-RTS, RTS

becomes active when the receiver needs more data and notiﬁes the sending serial

device. When RTS is connected to CTS, data transmission does not occur unless the

receiver FIFO has space for the data; thus, overrun errors are eliminated using

UART 1 and UART 2 from a SC16C550 with the autoﬂow control enabled. If not,

overrun errors occur when the transmit data rate exceeds the receiver FIFO read

latency.

6.3.1

Auto-RTS (see Figure 5)

Auto-RTS data ﬂow control originates in the receiver timing and control block (see

Figure 1 “Block diagram.”) and is linked to the programmed receiver FIFO trigger

level. When the receiver FIFO level reaches a trigger level of 1, 4, or 8 (see Figure 7),

RTS is de-asserted. With trigger levels of 1, 4, and 8, the sending 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 de-assertion of RTS until

after it has begun sending the additional byte. RTS is automatically reasserted once

the RX FIFO is emptied by reading the receiver buffer register. When the trigger level

is 14 (see Figure 8), RTS is de-asserted after the ﬁrst data bit of the 16th character is

present on the RX line. RTS is reasserted when the RX FIFO has at least one

available byte space.

Table 4:

Flow control mechanism

Selected trigger level

(characters)

INT pin activation

Negate RTS or

send Xoff

Assert RTS or

send Xon

11

4

1

44

8

4

8

12

8

14

10

Fig 5.

Autoﬂow control (auto-RTS and auto-CTS) example.

RCV

FIFO

SERIAL TO

PARALLEL

FLOW

CONTROL

XMT

FIFO

PARALLEL

TO SERIAL

FLOW

CONTROL

PARALLEL

TO SERIAL

FLOW

CONTROL

SERIAL TO

PARALLEL

FLOW

XMT

FIFO

RCV

FIFO

ACE1

ACE2

D7 – D0

RX

TX

RTS

CTS

TX

RX

D7 – D0

CONTROL

002aaa048

CTS

RTS

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