參數(shù)資料
型號: W83977CTF-AW
英文描述: PERIPHERAL (MULTIFUNCTION) CONTROLLER
中文描述: 周邊(多功能)控制器
文件頁數(shù): 62/161頁
文件大小: 592K
代理商: W83977CTF-AW
W83977EF/ CTF
PRELIMINARY
Publication Release Date: March 1999
-53 -
Revision A1
3.2.8 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
the baud generator is the baud rate multiplied by 16, and this is the base frequency for the transmitter
and receiver. The table in the next page illustrates the use of the baud generator with a frequency of
1.8461 MHz. In high-speed UART mode (refer to CR0C bit7 and CR0C bit6), the programmable
baud generator directly uses 24 MHz and the same divisor as the normal speed divisor. In high-
speed mode, the data transmission rate can be as high as 1.5 Mbps.
3.2.9 User-defined Register (UDR) (Read/Write)
This is a temporary register that can be accessed and defined by the user.
TABLE 3-5 BAUD RATE TABLE
-1. The output frequency of
BAUD RATE FROM DIFFERENT PRE-DIVIDER
Pre-Div:1.625
14.769M Hz
24M Hz
Pre-Div: 13
1.8461M Hz
Pre-Div: 1.0
Decimal divisor used
to generate 16X
clock
2304
1536
1047
857
768
384
192
96
64
58
48
32
24
16
12
6
3
2
1
Error Percentage between
desired and actual
50
75
110
134.5
150
300
600
1200
1800
2000
2400
3600
4800
7200
9600
19200
38400
57600
115200
400
600
880
1076
1200
2400
4800
9600
14400
16000
19200
28800
38400
57600
76800
153600
307200
460800
921600
650
975
1430
1478.5
1950
3900
7800
15600
23400
26000
31200
46800
62400
93600
124800
249600
499200
748800
1497600
**
**
0.18%
0.099%
**
**
**
**
**
0.53%
**
**
**
**
**
**
**
**
**
** The percentage error for all baud rates, except where indicated otherwise, is 0.16%.
Note. Pre-Divisor is determined by CRF0 of UART A and B.
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