REV. 4.2.2 2.9 Programmable Baud Rate Generator A single baud rate generat" />
參數(shù)資料
型號(hào)： ST16C2552IJ44TR-F
廠(chǎng)商： Exar Corporation
文件頁(yè)數(shù)： 2/34頁(yè)
文件大?。?/td> 0K
描述： IC UART FIFO 16B DUAL 44PLCC
標(biāo)準(zhǔn)包裝： 500
特點(diǎn)： *
通道數(shù)： 2，DUART
FIFO's： 16 字節(jié)
規(guī)程： RS232，RS485
電源電壓： 3.3 V ~ 5 V
帶故障啟動(dòng)位檢測(cè)功能： 是
帶調(diào)制解調(diào)器控制功能： 是
帶CMOS： 是
安裝類(lèi)型： 表面貼裝
封裝/外殼： 44-LCC（J 形引線(xiàn)）
供應(yīng)商設(shè)備封裝： 44-PLCC（16.59x16.59）
包裝： 帶卷 (TR)
ST16C2552
10
2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO
REV. 4.2.2
2.9
Programmable Baud Rate Generator
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 operating with a crystal frequency of up to 24
MHz. However, with an external clock input on XTAL1 pin and a 2K ohms pull-up resistor on XTAL2 pin (as
shown in Figure 5) it can extend its operation up to 64 MHz (4Mbps serial data rate) at room temperature and
5.0V.
FIGURE 5. EXTERNAL CLOCK CONNECTION FOR EXTENDED DATA RATE
2K
XTAL1
XTAL2
R1
VCC
External Clock
vcc
gnd
To obtain maximum data rate, it is necessary to use full rail swing on the clock input. See external clock
operating frequency over power supply voltage chart in Figure 6.
FIGURE 6. OPERATING FREQUENCY CHART. REQUIRES A 2K OHMS PULL-UP RESISTOR ON XTAL2 PIN TO INCREASE
OPERATING SPEED
.
60
50
40
30
3.0
4.5
5.5
3.5 4.0
5.0
Suppy Voltage
X
T
A
L1
E
xt
ernal
Clock
F
req
uency
in
MHz
.
70
80
85oC
25oC
-40oC
Operating frequency for ST16C2550
with external clock and a 2K ohms
pull-up resistor on XTAL2 pin.
The 2552 divides the basic external clock by 16. The basic 16X clock provides table rates to support standard
and custom applications using the same system design. The Baud Rate Generator divides this 16X clock by
any divisor from 1 to 216 -1. The rate table is configured via the DLL and DLM internal register functions.
Customized Baud Rates can be achieved by selecting the proper divisor values for the MSB and LSB sections
of baud rate generator.
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