參數(shù)資料
型號(hào)： ST16C1550
廠商： Exar Corporation
英文描述： 2.97V TO 5.5V UART WITH 16-BYTE FIFO
中文描述： 2.97V至5.5V的UART具有16字節(jié)FIFO
文件頁(yè)數(shù)： 9/37頁(yè)
文件大?。?/td> 428K
代理商： ST16C1550
á
REV. 4.2.0
ST16C1550/51
2.97V TO 5.5V UART WITH 16-BYTE FIFO
9
2.4
The UART has its own Baud Rate Generator (BRG) with a prescaler. The prescaler is controlled by a software
bit in the MCR register. The MCR register bit-7 sets the prescaler to divide the input crystal or external clock by
1 or 4. The clock output of the prescaler goes to the BRG. The BRG further divides this clock by a
programmable divisor between 1 and (2
16
-1) to obtain a 16X sampling clock of the serial data rate. The
sampling clock is used by the transmitter for data bit shifting and
receiver for data sampling. The BRG divisor
(DLL and DLM registers) defaults to a random value upon power up or a reset. Therefore, the BRG must be
programmed during initialization to the operating data rate. Programming the Baud Rate Generator Registers
DLM and DLL provides the capability of selecting the operating data rate.
Table 2
shows the standard data
rates available with a 14.7456 MHz crystal or external clock at 16X clock rate. When using a non-standard data
rate crystal or external clock, the divisor value can be calculated for DLL/DLM with the following equation.
Programmable Baud Rate Generator
F
IGURE
4. T
YPICAL
OSCILLATOR
CONNECTIONS
divisor (decimal) = (XTAL1 clock frequency / prescaler) / (serial data rate x 16)
C1
22-47pF
C2
22-47pF
Y1
1.8432 MHz
to
24 MHz
R1
0-120
(Optional)
R2
500K - 1M
XTAL1
XTAL2
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST16C1550_05 制造商:EXAR 制造商全稱(chēng):EXAR 功能描述:2.97V TO 5.5V UART WITH 16-BYTE FIFO
ST16C1550CJ28 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述:
ST16C1550CJ28-F 功能描述:UART 接口集成電路 UART W/16BYTE FIFO RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
ST16C1550CJ28-F 制造商:Exar Corporation 功能描述:IC SGL UART 1.5MBPS 5.5V 28-PLCC
ST16C1550CJ28TR-F 功能描述:UART 接口集成電路 UART W/16BYTE FIFO RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
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