参数资料
型号: MB89637RPF
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP64
封装: PLASTIC, QFP-64
文件页数: 148/153页
文件大小: 7326K
代理商: MB89637RPF
HARDWARE CONFIGURATION
2-71
(e) Expression for Calculating Dedicated Baud Rate (UART)
The dedicated baud rate is determined by the settings of the clock gear, clock division ratio registers (SCS1
and SCS0), and baud rate select registers (RC2, RC1 and RC0). The baud rate is calculated as follows:
Clock division ratio (SCS1, SCS0)
When using a dedicated baud rate, set the clock division ratio register SCS1 to 1 and SCS0 to 0. The clock
division ratio results in 1/8 in the asynchronous mode.
Baud rate selection (RC2, RC1, RC0)
The baud rates can be selected depending on the settings of RC2, RC1, and RC0. For example, the baud
rates at an original oscillation of 10 MHz are listed in the following table.
(Original oscillation: 10 MHz)
SCS1
SCS0
Clock input
Asynchronous mode
1
Dedicated baud rate
1/8
RC2
RC1
RC0
Division ratio selected as
baud rate
CLK in asynchronous
mode (
s/baud)
0
13
104/9615
0
1
26
208/4808
0
1
0
52
416/2404
0
1
104
832/1202
1
0
208
1664/601
1
0
1
416
3328/300
1
0
2
16/62500
1
16
128/7813
1
Baud rate
=
64/f ch
16/f ch
8/f ch
4/f ch
Clock gear selection
Clock division ratio
(SCS1, SCS0)
Baud rate selection
(RC2, RC1, RC0)
X 10/4 X
X
= 0.4
s (4/f ch) X 10/4 X 8 (asynchronous mode) X 13 (RC2 = RC1 = TC0 = 0)
[ex]
1
9615 baud
fch: Frequency of original oscillation
(fch = 10 MHz)
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