参数资料
型号: SC16C554IB80,551
厂商: NXP Semiconductors
文件页数: 10/55页
文件大小: 0K
描述: IC UART QUAD W/FIFO 80-LQFP
标准包装: 119
通道数: 4,QUART
FIFO's: 16 字节
电源电压: 2.5V,3.3V,5V
带自动流量控制功能:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
带CMOS:
安装类型: 表面贴装
封装/外壳: 80-LQFP
供应商设备封装: 80-LQFP(12x12)
包装: 托盘
其它名称: 568-3271
935270075551
SC16C554IB80-S
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
Koninklijke Philips Electronics N.V. 2004. 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 Mbit/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
22 pF
C2
47 pF
XT
AL1
XT
AL2
X1
1.8432 MHz
C1
47 pF
C2
100 pF
XT
AL1
XT
AL2
1.5 k
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