參數(shù)資料
型號： XR17C158CV
英文描述： UART
中文描述： 異步
文件頁數(shù)： 21/55頁
文件大?。?/td> 734K
代理商： XR17C158CV
XR17C158
PCI BUS OCTAL UART
á
REV. 1.1.3
21
divide the input crystal or external clock by 1 or 4. The
output of the prescaler clocks to the BRG. The BRG
further divides this clock by a programmable divisor
between 1 and (2
16
-1) to obtain a 16X or 8X sam-
pling clock of the serial data rate. The sampling clock
is used by the transmitter for data bit shifting and
re-
ceiver for data sampling. The BRG divisor (DLL and
DLM registers) defaults to a random value upon pow-
er up. Therefore, the BRG must be programmed dur-
ing initialization to the operating data rate.
Programming the Baud Rate Generator Registers
DLM and DLL provides the capability for selecting the
operating data rate.
Table 9
shows the standard data
rates available with a 14.7456 MHz crystal or external
clock at 16X clock rate. At 8X sampling rate, these
data rates would double. When using a non-standard
data rate crystal or external clock, the divisor value
can be calculated with the following equation(s).
F
IGURE
8. B
AUD
R
ATE
G
ENERATOR
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 or 8X
Sampling
Rate Clock to
Transmitter
and Receiver
To Other
Channels
Baud Rate
Generator
Logic
divisor (decimal) = (XTAL1 clock frequency / prescaler) / (serial data rate x 16),
WITH
8XMODE [7:0]
IS
0
divisor (decimal) = (XTAL1 clock frequency / prescaler / (serial data rate x 8),
WITH
8XMODE [7:0]
IS
1
T
ABLE
9: T
YPICAL
DATA
RATES
WITH
A
14.7456 MH
Z
CRYSTAL
OR
EXTERNAL
CLOCK
AT
16X S
AMPLING
O
UTPUT
Data Rate
MCR Bit-7=1
O
UTPUT
Data Rate
MCR Bit-7=0
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
600
1200
2400
4800
9600
19.2k
38.4k
57.6k
400
2400
4800
9600
19.2k
38.4k
76.8k
153.6k
230.4k
2304
384
192
96
48
24
12
6
4
900
180
C0
60
30
18
0C
06
04
09
01
00
00
00
00
00
00
00
00
80
C0
60
30
18
0C
06
04
0
0
0
0
0
0
0
0
0
115.2k
230.4k
460.8k
921.6k
2
1
02
01
00
00
02
01
0
0
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