AT90PWM2B-16SU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2B-16SU

8-bit Atmel Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

AT90PWM2/3/2B/3B

Table 18-9. Examples of UBRR Settings for Commonly Frequencies

Baud

Rate

(bps)

fclkio = 1.0000 MHz

U2X = 0

U2X = 1

UBRR Error UBRR Error

fclkio = 1.8432 MHz

U2X = 0

U2X = 1

UBRR Error UBRR Error

2400

25

0.2%

51

0.2%

47

0.0%

95

0.0%

4800

12

0.2%

25

0.2%

23

0.0%

47

0.0%

9600

6

-7.0%

12

0.2%

11

0.0%

23

0.0%

14.4k

3

8.5%

8

-3.5%

7

0.0%

15

0.0%

19.2k

2

8.5%

6

-7.0%

5

0.0%

11

0.0%

28.8k

1

8.5%

3

8.5%

3

0.0%

7

0.0%

38.4k

1

-18.6%

2

8.5%

2

0.0%

5

0.0%

57.6k

0

8.5%

1

8.5%

1

0.0%

3

0.0%

76.8k

–

–

1

-18.6%

1

-25.0%

2

0.0%

115.2k

–

–

0

8.5%

0

0.0%

1

0.0%

230.4k

–

–

–

–

–

–

0

0.0%

250k

–

–

–

–

–

–

–

–

500k

–

–

–

–

–

–

–

–

1M

Max. (1)

–

–

62.5 kbps

–

–

125 kbps

–

–

115.2 kbps

–

–

230.4 Kbps

1.

UBRR = 0, Error = 0.0%

fclkio = 2.0000 MHz

U2X = 0

U2X = 1

UBRR Error UBRR Error

51

0.2%

103

0.2%

25

0.2%

51

0.2%

12

0.2%

25

0.2%

8

-3.5%

16

2.1%

6

-7.0%

12

0.2%

3

8.5%

8

-3.5%

2

8.5%

6

-7.0%

1

8.5%

3

8.5%

1

-18.6%

2

8.5%

0

8.5%

1

8.5%

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

125 kpbs

250 kbps

Table 18-10. Examples of UBRR Settings for Commonly Frequencies (Continued)

Baud

Rate

(bps)

fclkio = 3.6864 MHz

U2X = 0

U2X = 1

UBRR Error UBRR Error

fclkio = 4.0000 MHz

U2X = 0

U2X = 1

UBRR Error UBRR Error

2400

95

0.0%

191

0.0%

103

0.2%

207

0.2%

4800

47

0.0%

95

0.0%

51

0.2%

103

0.2%

9600

23

0.0%

47

0.0%

25

0.2%

51

0.2%

14.4k

15

0.0%

31

0.0%

16

2.1%

34

-0.8%

19.2k

11

0.0%

23

0.0%

12

0.2%

25

0.2%

28.8k

7

0.0%

15

0.0%

8

-3.5%

16

2.1%

38.4k

5

0.0%

11

0.0%

6

-7.0%

12

0.2%

57.6k

3

0.0%

7

0.0%

3

8.5%

8

-3.5%

76.8k

2

0.0%

5

0.0%

2

8.5%

6

-7.0%

115.2k

1

0.0%

3

0.0%

1

8.5%

3

8.5%

230.4k

0

0.0%

1

0.0%

0

8.5%

1

8.5%

250k

0

-7.8%

1

-7.8%

0

0.0%

1

0.0%

fclkio = 7.3728 MHz

U2X = 0

U2X = 1

UBRR Error UBRR Error

191

0.0%

383

0.0%

95

0.0%

191

0.0%

47

0.0%

95

0.0%

31

0.0%

63

0.0%

23

0.0%

47

0.0%

15

0.0%

31

0.0%

11

0.0%

23

0.0%

7

0.0%

15

0.0%

5

0.0%

11

0.0%

3

0.0%

7

0.0%

1

0.0%

3

0.0%

1

-7.8%

3

-7.8%

4317K–AVR–03/2013

209

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