參數(shù)資料
型號(hào): XR16C2850IJ44
廠商: EXAR CORP
元件分類(lèi): 微控制器/微處理器
英文描述: 3.3V AND 5V DUART WITH 128-BYTE FIFO
中文描述: 2 CHANNEL(S), 3.125M bps, SERIAL COMM CONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁(yè)數(shù): 10/43頁(yè)
文件大?。?/td> 611K
代理商: XR16C2850IJ44
á
3.3V AND 5V DUART WITH 128-BYTE FIFO
XR16C2850
REV. 2.0.0
10
Programming the Baud Rate Generator Registers
DLM and DLL provides the capability of selecting the
operating data rate. Table 5 shows the standard data
rates available with a 14.7456 MHz crystal or external
clock at 16X sampling rate clock rate. A 16X sampling
clock is typically used. However, user can select the
8X sampling clock rate mode to double the operating
data rate. When using a non-standard data rate crys-
tal or external clock, the divisor value can be calculat-
ed for DLL/DLM with the following equation.
F
IGURE
6. B
AUD
R
ATE
G
ENERATOR
AND
P
RESCALER
XTAL1
XTAL2
Crystal
Osc/
Buffer
MCR Bit-7=0
(default)
MCR Bit-7=1
DLL and DLM
Registers
Prescaler
Divide by 1
Prescaler
Divide by 4
16X
Sampling
Rate Clock to
Transmitter
Baud Rate
Generator
Logic
divisor (decimal) = (XTAL1 clock frequency / prescaler) / (serial data rate x 16), with CLK8/16 pin = 1
divisor (decimal) = (XTAL1 clock frequency / prescaler) / (serial data rate x 8), with CLK8/16 pin = 0
T
ABLE
5: T
YPICAL
DATA
RATES
WITH
A
14.7456 MH
Z
CRYSTAL
OR
EXTERNAL
CLOCK
O
UTPUT
Data Rate
MCR Bit-7=1
O
UTPUT
Data Rate
MCR Bit-7=0
(D
EFAULT
)
D
IVISOR
FOR
16x
Clock (Decimal)
D
IVISOR
FOR
16x
Clock (HEX)
DLM
P
ROGRAM
V
ALUE
(HEX)
DLL
P
ROGRAM
V
ALUE
(HEX)
D
ATA
R
ATE
E
RROR
(%)
100
400
2304
900
09
00
0
600
2400
384
180
01
80
0
1200
4800
192
C0
00
C0
0
2400
9600
96
60
00
60
0
4800
19.2k
48
30
00
30
0
9600
38.4k
24
18
00
18
0
19.2k
76.8k
12
0C
00
0C
0
38.4k
153.6k
6
06
00
06
0
57.6k
230.4k
4
04
00
04
0
115.2k
460.8k
2
02
00
02
0
230.4k
921.6k
1
01
00
01
0
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