SC16C554DIB64 datasheet(18/55 Pages) PHILIPS

18 / 55 page

Philips Semiconductors

SC16C554/554D

Quad UART with 16-byte FIFO and infrared (IrDA) encoder/decoder

Product data

Rev. 05 — 10 May 2004

18 of 55

9397 750 13132

6.10 Programmable baud rate generator

The SC16C554/554D supports high speed modem technologies that have increased

input data rates by employing data compression schemes. For example, a 33.6 kbit/s

modem that employs data compression may require a 115.2 kbit/s input data rate.

A 128.0 kbit/s ISDN modem that supports data compression may need an input

data rate of 460.8 kbit/s.

A single baud rate generator is provided for the transmitter and receiver, allowing

independent TX/RX channel control. The programmable Baud Rate Generator is

capable of accepting an input clock up to 80 MHz (for 3.3 V and 5 V operation), as

required for supporting a 5 Mbit/s data rate. The SC16C554/554D can be conﬁgured

for internal or external clock operation. For internal clock oscillator operation, an

industry standard microprocessor crystal (parallel resonant/22-33 pF load) is

connected externally between the XTAL1 and XTAL2 pins (see Figure 7).

Alternatively, an external clock can be connected to the XTAL1 pin to clock the

internal baud rate generator for standard or custom rates (see Table 7).

Programming the Baud Rate Generator Registers DLM (MSB) and DLL (LSB)

provides a user capability for selecting the desired ﬁnal baud rate.

Fig 7.

Crystal oscillator connection.

Table 7:

Baud rate generator programming table using a 7.3728 MHz clock

Output baud rate

User

× clock divisor

DLM

program value

(HEX)

DLL

program value

(HEX)

Decimal

HEX

200

2304

900

1200

384

180

2400

192

4800

9600

19.2 k

38.4 k

76.8 k

153.6 k

230.4 k

460.8 k

002aaa169

1.8432 MHz

22 pF

47 pF

1.8432 MHz

47 pF

100 pF

1.5 k

Ω

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