7643 datasheet(167/424 Pages) RENESAS

167 / 424 page

Rev.2.00

Aug 28, 2006

page 46 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.4 UART

2.4.4 Transfer bit rate

Table 2.4.1 shows setting examples of the baud rate generator (BRG) values and transfer bit rate values.

The internal clock

φ is selected for the UART clock.

Table 2.4.1 Setting examples of baud rate generator values and transfer bit rate values (

φφφφφ = 12 MHz))

φ/1 (Note 1)

BRG setting Transfer

value

bit rate (bps)

00 (0016)

750,000.0

01 (0116)

375,000.0

02 (0216)

250,000.0

03 (0316)

187,500.0

04 (0416)

150,000.0

05 (0516)

125,000.0

06 (0616)

107,142.9

07 (0716)

93,750.0

08 (0816)

83,333.3

09 (0916)

75,000.0

10 (0A16)

68,181.8

11 (0B16)

65,250.0

12 (0C16)

57,692.3

13 (0D16)

53,571.4

14 (0E16)

50,000.0

15 (0F16)

46,875.0

φ/8 (Note 1)

BRG setting Transfer

value

bit rate (bps)

φ/32 (Note 1)

BRG setting Transfer

value

bit rate (bps)

φ/256 (Note 1)

BRG setting Transfer bit

value

rate (bps)

00 (0016)

93,750.0

01 (0116)

46,875.0

02 (0216)

31,250.0

03 (0316)

23,437.5

04 (0416)

18,750.0

05 (0516)

15,625.0

06 (0616)

13,392.8

07 (0716)

11,718.7

08 (0816)

10,416.6

09 (0916)

9,375.0

10 (0A16)

8,522.7

11 (0B16)

7,812.5

12 (0C16)

7,211.5

13 (0D16)

6,696.4

14 (0E16)

6,250.0

15 (0F16)

5,859.3

00 (0016)

23,437.5

01 (0116)

11,718.7

02 (0216)

7,812.5

03 (0316)

5,859.4

04 (0416)

4,687.5

05 (0516)

3,906.3

06 (0616)

3,348.2

07 (0716)

2,929.7

08 (0816)

2,604.2

09 (0916)

2,343.7

10 (0A16)

2,130.6

11 (0B16)

1,953.1

12 (0C16)

1,802.8

13 (0D16)

1,674.1

14 (0E16)

1,562.5

15 (0F16)

1,464.8

00 (0016)

2,929.7

01 (0116)

1,464.8

02 (0216)

976.6

03 (0316)

732.4

04 (0416)

585.9

05 (0516)

488.3

06 (0616)

418.5

07 (0716)

366.2

08 (0816)

325.5

09 (0916)

292.9

10 (0A16)

266.3

11 (0B16)

244.1

12 (0C16)

225.3

13 (0D16)

209.2

14 (0E16)

195.3

15 (0F16)

183.1

253 (FD16)

11.5

254 (FE16)

11.4

255 (FF16)

11.4

253 (FD16)

2,952.7

254 (FE16)

2,941.1

255 (FF16)

2,929.7

253 (FD16)

369.0

254 (FE16)

367.6

255 (FF16)

366.2

253 (FD16)

92.2

254 (FE16)

91.9

255 (FF16)

91.6

Notes 1: Select the UART clock prescaling with bits 1 and 2 of UART mode register.

2: Equation of transfer bit rate:

✽ : fi is selectable among

φ/1, φ/8, φ/32, and φ/256 with bits 1 and 2 of UART mode register.

Transfer bit rate (bps) =

(BRG setting value + 1) ✕ 16

fi✽

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