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參數(shù)資料
| 型號： | 935270030157 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 1 CHANNEL(S), 3M bps, SERIAL COMM CONTROLLER, PQFP48 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-313-2, LQFP-48 |
| 文件頁數(shù)： | 5/53頁 |
| 文件大?。?/td> | 704K |
| 代理商： | 935270030157 |
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Philips Semiconductors
SC16C650A
Universal Asynchronous Receiver/Transmitter (UART)
with 32-byte FIFO and infrared (IrDA) encoder/decoder
Product data
Rev. 03 — 13 March 2003
13 of 49
9397 750 11207
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
6.7 Programmable baud rate generator
The SC16C650A 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 48 MHz, as required for supporting a
3 Mbits/s data rate. The SC16C650A 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 5). 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 5).
The generator divides the input 16
× clock by any divisor from 1 to 216 1. The
SC16C650A divides the basic crystal or external clock by 16. The frequency of the
BAUDOUT output pin is exactly 16
× (16 times) of the selected baud rate
(BAUDOUT = 16 Baud Rate). Customized baud rates can be achieved by selecting
the proper divisor values for the MSB and LSB sections of baud rate generator.
Setting MCR[7] to a logic 1 provides an additional divide-by-4, whereas setting
MCR[7] to a logic 0 only divides by 1 (see Table 5 and Figure 6).
Programming the Baud Rate Generator registers DLM (MSB) and DLL (LSB)
provides a user capability for selecting the desired nal baud rate. The example in
Table 5 shows selectable baud rates when using a 1.8432 MHz crystal and setting
MCR[7] to a logic 0.
For custom baud rates, the divisor value can be calculated using the following
equation:
(1)
Fig 5.
Crystal oscillator connection.
002aaa169
X1
1.8432 MHz
C1
68 pF
C2
68 pF
XT
AL1
XT
AL2
Divisor (in decimal)
XTAL1 clock frequency
serial data rate
16
×
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