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FUJITSU MB91460 SERIES FR60 User Manual

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Chapter 32 USART (LIN / FIFO)

6.USART Baud Rates

Suggested Division Ratios for different machine speeds and baud rates

The following settings are suggested for different MCU clock speeds and baud rates:

Counting Example

Assume the reload value is 832. The figure

6-2

demonstrates the behavior of the both Reload Counters:

Table 6-1 Suggested Baud Rates and reload values at different machine speeds.

Baud

rate

8 MHz

10 MHz

16 MHz

20 MHz

24 MHz

32 MHz

value

%

dev.

value

%

dev.

value

%

dev.

value

%

dev.

value

%

dev.

value

%

dev.

2M

3

0

4

0

7

0

9

0

11

0

15

0

1M

7

0

9

0

15

0

19

0

23

0

31

0

500000

15

0

19

0

31

0

39

0

47

0

63

0

460800

-

-

-

-

-

-

-

-

51

-0.16

-

-

250000

31

0

39

0

63

0

79

0

95

0

127

0

230400

-

-

-

-

-

-

86

0.22

103

-0.16

138

-0.08

153600

51

-0.16

64

-0.16

103

-0.16

129

-0.16

155

-0.16

207

0.16

125000

63

0

79

0

127

0

159

0

191

0

255

0

115200

-

-

86

0.22

138

0.08

173

0.22

207

-0.16

278

-0.08

76800

103

-0.16

129

-0.16

207

-0.16

259

-0.16

311

-0.16

416

0.08

57600

138

0.08

173

0.22

277

0.08

346

-0.06

416

0.08

555

0.08

38400

207

-0.16

259

-0.16

416

0.08

520

0.03

624

0

832

-0.04

28800

277

0.08

346

<0.01

554

-0.01

693

-0.06

832

-0.03

1110

-0.01

19200

416

0.08

520

0.03

832

-0.03

1041

0.03

1249

0

1666

0.02

10417

767

<0.01

959

<0.01

1535

<0.01

1919

<0.01

2303

<0.01

3071

<0.01

9600

832

0.04

1041

0.03

1666

0.02

2083

0.03

2499

0

3332

0.01

7200

1110

<0.01

1388

<0.01

2221

<0.01

2777

<0.01

3332

<0.01

4443

-0.01

4800

1666

0.02

2082

-0.02

3332

<0.01

4166

<0.01

4999

0

6666

<0.01

2400

3332

<0.01

4166

<0.01

6666

<0.01

8332

<0.01

9999

0

13332

<0.01

1200

6666

<0.01

8334

0.02

13332

<0.01

16666

<0.01

19999

0

26666

<0.01

600

13332

<0.01

16666

<0.01

26666

<0.01

-

-

-

-

300

26666

<0.01

-

-

-

-

-

-

-

-