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| 型号： | 935271490512 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 4 CHANNEL(S), 5M bps, SERIAL COMM CONTROLLER, PQCC68 |
| 封装： | PLASTIC, MS-018, SOT-188-2, LCC-68 |
| 文件页数： | 10/56页 |
| 文件大小： | 715K |
| 代理商： | 935271490512 |
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Philips Semiconductors
SC16C554/554D
Quad UART with 16-byte FIFO and infrared (IrDA) encoder/decoder
Product data
Rev. 02 — 13 March 2003
18 of 53
9397 750 11002
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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 Mbits/s data rate. The SC16C554/554D can be congured
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 nal baud rate.
Fig 7.
Crystal oscillator connection.
Table 7:
Baud rate generator programming table using a 7.3728 MHz clock
Output baud rate
User
16
× clock divisor
DLM
program value
(HEX)
DLL
program value
(HEX)
Decimal
HEX
200
2304
900
09
00
1200
384
180
01
80
2400
192
C0
00
C0
4800
96
60
00
60
9600
48
30
00
30
19.2 k
24
18
00
18
38.4 k
12
0C
00
0C
76.8 k
6
06
00
06
153.6 k
3
03
00
03
230.4 k
2
02
00
02
460.8 k
1
01
00
01
002aaa169
X1
1.8432 MHz
C1
68 pF
C2
68 pF
XT
AL1
XT
AL2
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