參數(shù)資料
型號(hào): ST16C554D
廠商: Exar Corporation
英文描述: Quad UART with 16-Byte FIFO(四通用異步接收器/發(fā)送器(帶16字節(jié)的先進(jìn)先出))
中文描述: 四路的UART具有16字節(jié)FIFO(四通用異步接收器/發(fā)送器(帶16字節(jié)的先進(jìn)先出))
文件頁(yè)數(shù): 14/40頁(yè)
文件大?。?/td> 506K
代理商: ST16C554D
ST16C554/554D/68C554
14
Rev. 3.10
The generator divides the input 16X clock by any
divisor from 1 to 2
16
-1. The 554D divides the basic
crystal or external clock by 16. Further division of this
16X clock provides two table rates to support low and
high data rate applications using the same system
design. Customized Baud Rates can be achieved by
selecting the proper divisor values for the MSB and
LSB sections 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 5 below, shows the two selectable baud rate
tables available when using a 7.3728 MHz crystal.
C1
22pF
C2
33pF
X1
1.8432 MHz
X
X
Figure 8, Crystal oscillator connection
Table 5, BAUD RATE GENERATOR PROGRAMMING TABLE:
Output
Baud Rate
(1.8432 MHz (7.3728 MHz
Clock)
Output
Baud Rate
User
User
DLM
Program
Value
(HEX)
DLL
16 x Clock
Divisor
(Decimal)
16 x Clock
Divisor
(HEX)
Program
Value
(HEX)
Clock)
50
300
600
1200
2400
4800
9600
19.2k
38.4k
57.6k
115.2k
200
1200
2400
4800
9600
19.2K
38.4k
76.8k
153.6k
230.4k
460.8k
2304
384
192
96
48
24
12
6
3
2
1
900
180
C0
60
30
18
0C
06
03
02
01
09
01
00
00
00
00
00
00
00
00
00
00
80
C0
60
30
18
0C
06
03
02
01
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