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參數(shù)資料
型號(hào): W83787IF
廠商: WINBOND ELECTRONICS CORP
元件分類: 外設(shè)及接口
英文描述: WINBOND I/O WITH SERIAL-INFRARED SUPPORT
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封裝: PLASTIC, QFP-100
文件頁數(shù): 43/123頁
文件大小: 1751K
代理商: W83787IF
W83787IF
Publication Release Date:Sep 1995
- 43 -
Revision A1
4.2.8 Programmable Baud Generator (BLL/BHL) (Read/Write)
Two 8-bit registers, BLL and BHL, compose a programmable baud generator that uses 24 MHz to
generate a 1.8461 MHz frequency and divides it by a divisor from 1 to 2
16
-1. The output frequency of
the baud generator is the baud rate multiplied by 16, and this is the base frequency for the transmitter
and receiver. The following table illustrates the use of the baud generator with frequency of 1.8461
Mhz. In high speed UART mode (refer CR0C.bit7 and CR0C.bit6), the programmable baud generator
directly uses 24 MHZ and the divider which is same as normal speed divisor. In the high speed mode,
the data transmission rate can be up to 1.5 M bps.
TABLE 4-6 BAUD RATE TABLE
BAUD RATE USING 24 MHZ TO GENERATE 1.8461 MHZ
Desired Baud Rate
Decimal divisor used to
generate 16X clock
50
75
110
134.5
150
300
600
1200
1800
2000
2400
3600
4800
7200
9600
19200
38400
57600
115200
230400
460800
921600
1.5M
Percent error difference
between desired and actual
**
**
0.18%
0.099%
**
**
**
**
**
0.53%
**
**
**
**
**
**
**
**
**
**
**
**
0%
2304
1536
1047
857
768
384
192
96
64
58
48
32
24
16
12
6
3
2
1
104*
52*
26*
1*
* Only use in high speed mode (refer CR0C.bit7 and CR0C.bit6).
** The percentage error for all baud rates, except where indicated otherwise, is 0.16%.
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