HT46RU66_14 datasheet(44/69 Pages) HOLTEK

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HT46RU66/HT46CU66

Rev. 1.40

44

2014-06-06

·

波特率和误差的计算

系统选用 8M 晶振且 BRGH=0，若期望的波特率为 9600，计算它的 BRG 寄存器的值 N，

实际波特率和误差。

根据上表，波特率 BR =

)

1

(

64

+

N

f

SYS

转换后的公式

N =

1

64

*

−

BR

f

SYS

代入参数

N =

1

64

*

9600

8000000 − =12.0208

取最接近的值，十进制 12 写入 BRG 寄存器，实际波特率如下

BR =

9615

)

1

12

(

64

8000000 =

+

误差

%

16

.

0

9600

9615

=

−

下面两表给出 BRGH 取不同值时的实际波特率和误差。

波特率

K/BPS

BRGH=0

f

SYS =8MHz

f

SYS =7.159MHz

f

SYS =4MHz

f

SYS =3.579545MHz

BRG

Kbaud

Error BRG

Kbaud

Error BRG Kbaud Error BRG Kbaud

Error

0.3

-

207

0.300

0.00

185

0.300

0.00

1.2

103

1.202

0.16

92

1.203

0.23

51

1.202

0.16

46

1.19

-0.83

2.4

51

2.404

0.16

46

2.38

-0.83

25

2.404

0.16

22

2.432

1.32

4.8

25

4.807

0.16

22

4.863

1.32

12

4.808

0.16

11

4.661

-2.9

9.6

12

9.615

0.16

11

9.322

-2.9

6

8.929

-6.99

5

9.321

-2.9

19.2

6

17.857

-6.99

5

18.64

-2.9

2

20.83

8.51

2

18.643

-2.9

38.4

2

41.667

8.51

2

37.29

-2.9

1

-

1

-

57.6

1

62.5

8.51

1

55.93

-2.9

0

62.5

8.51

0

55.93

-2.9

115.2

0

125

8.51

0

111.86

-2.9

-

BRGH=0 时的波特率和误差

波特率

K/BPS

BRGH=1

f

SYS =8MHz

f

SYS =7.159MHz

f

SYS =4MHz

f

SYS =3.579545MHz

BRG Kbaud

Error

BRG

Kbaud

Error BRG Kbaud Error BRG Kbaud

Error

0.3

-

1.2

-

207

1.202

0.16

185

1.203

0.23

2.4

207

2.404

0.16

185

2.405

0.23

103

2.404

0.16

92

2.406

0.23

4.8

103

4.808

0.16

92

4.811

0.23

51

4.808

0.16

46

4.76

-0.83

9.6

51

9.615

0.16

46

9.520

-0.832

25

9.615

0.16

22

9.727

1.32

19.2

25

19.231

0.16

22

19.454

1.32

12

19.231

0.16

11

18.643

-2.9

38.4

12

38.462

0.16

11

37.287

-2.9

6

35.714

-6.99

5

37.286

-2.9

57.6

8

55.556

-3.55

7

55.93

-2.9

3

62.5

8.51

3

55.930

-2.9

115.2

3

125

8.51

3

111.86

-2.9

1

125

8.51

1

111.86

-2.9

250

1

250

0

-

0

250

0

-

BRGH=1 时的波特率和误差

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