参数资料
| 型号： | ST16C550CP40-F |
| 厂商： | Exar Corporation |
| 文件页数： | 2/35页 |
| 文件大小： | 0K |
| 描述： | IC INTERFACE UART |
| 标准包装： | 9 |
| 系列： | * |
| 其它名称： | 1016-1759 |
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ST16C550
10
Rev. 5.01
ample: T = [(programmed word length = 7) + (stop bit
= 1) + (start bit = 1) = 9]. 40 (bit times divided by 9) =
4.4 characters.
Example -B: If the user programs the word length = 7,
with parity and one stop bit, the time out will be:
T = 4 X 7(programmed word length) + 12 = 40 bit times.
Character time = 40 / 10 [ (programmed word length
= 7) + (parity = 1) + (stop bit = 1) + (start bit = 1) = 4
characters.
Programmable Baud Rate Generator
The ST16C550 supports high speed modem tech-
nologies that have increased input data rates by
employing data compression schemes. For example
a 33.6Kbps modem that employs data compression
may require a 115.2Kbps input data rate. A 128.0Kbps
ISDN modem that supports data compression may
need an input data rate of 460.8Kbps. The ST16C550
can support a standard data rate of 921.6Kbps.
The programmable Baud Rate Generator is capable
of accepting an input clock up to 24 MHz, as required
for supporting a 1.5Mbps data rate. The ST16C550 can
be configured for internal or external clock operation.
For internal clock oscillator operation, an industry
standard microprocessor crystal (parallel resonant/
22 pF load) is connected externally between the
XTAL1 and XTAL2 pins, with an external 1 M
resistor
across it. Alternatively, an external clock can be
connected to the XTAL1 pin to clock the internal baud
rate generator for standard or custom rates. See
figure 3 for crystal oscillator connection.
The generator divides the input 16X clock by any
divisor from 1 to 216 -1. The ST16C550 divides the
basic crystal or external clock by 16. The frequency of
the -BAUDOUT output pin is exactly 16X (16 times) of
the selected baud rate (-BAUDOUT =16 x Baud Rate).
Customized Baud Rates can be achieved by selecting
the proper divisor values for the MSB and LSB sec-
tions of baud rate generator.
Programming the Baud Rate Generator Registers
DLM (MSB) and DLL (LSB) provides a user capability
for selecting the desired final baud rate. The example
in Table 3 below shows selectable baud rates when
using a 1.8432 MHz crystal.
For custom baud rates, the divisor value can be calcu-
lated using the following equation:
Divisor (in decimal) = (XTAL1 clock frequency) / (serial data rate x 16)
Table 3, BAUD RATE GENERATOR PROGRAMMING TABLE (1.8432 MHz CLOCK):
Output
User
DLM
DLL
Baud Rate
16 x Clock
Program
Divisor
Value
(Decimal)
(HEX)
50
2304
900
09
00
75
1536
600
06
00
150
768
300
03
00
300
384
180
01
80
600
192
C0
00
C0
1200
96
60
00
60
2400
48
30
00
30
4800
24
18
00
18
7200
16
10
00
10
9600
12
0C
00
0C
19.2k
6
06
00
06
38.4k
3
03
00
03
57.6k
2
02
00
02
115.2k
1
01
00
01
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST16C550CP40-F | 制造商:Exar Corporation 功能描述:IC UART INTERFACE 1.5Mbps 5.5V DIP-40 |
| ST16C550CQ-0A-EVB | 功能描述:界面开发工具 Supports C550 48 ld TQFP, ISA Interface RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| ST16C550CQ48 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| ST16C550CQ48-F | 功能描述:UART 接口集成电路 2.97V-5.5V 16B FIFO temp 0C to 70C; UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| ST16C550CQ48TR-F | 功能描述:UART 接口集成电路 UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
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