7643_06 Datasheet, PDF (167/424 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

7643 Group
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 (φ = 12 MHz))
φ/1 (Note 1)
φ/8 (Note 1)
φ/32 (Note 1)
φ/256 (Note 1)
BRG setting Transfer BRG setting Transfer BRG setting Transfer BRG setting Transfer bit
value
bit rate (bps) value
bit rate (bps) value
bit rate (bps) value
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 00 (0016)
93,750.0
08 (0816)
83,333.3 01 (0116)
46,875.0
09 (0916)
75,000.0 02 (0216)
31,250.0
10 (0A16)
68,181.8 03 (0316)
23,437.5 00 (0016)
23,437.5
11 (0B16)
65,250.0 04 (0416)
18,750.0 01 (0116)
11,718.7
12 (0C16)
57,692.3 05 (0516)
15,625.0 02 (0216)
7,812.5
13 (0D16)
53,571.4 06 (0616)
13,392.8 03 (0316)
5,859.4
14 (0E16)
50,000.0 07 (0716)
11,718.7 04 (0416)
4,687.5
15 (0F16)
46,875.0 08 (0816)
10,416.6 05 (0516)
3,906.3
09 (0916)
9,375.0 06 (0616)
3,348.2
10 (0A16)
8,522.7 07 (0716)
2,929.7 00 (0016) 2,929.7
11 (0B16)
7,812.5 08 (0816)
2,604.2 01 (0116) 1,464.8
12 (0C16)
7,211.5 09 (0916)
2,343.7 02 (0216)
976.6
13 (0D16)
6,696.4 10 (0A16)
2,130.6 03 (0316)
732.4
14 (0E16)
6,250.0 11 (0B16)
1,953.1 04 (0416)
585.9
15 (0F16)
5,859.3 12 (0C16)
1,802.8 05 (0516)
488.3
13 (0D16)
1,674.1 06 (0616)
418.5
14 (0E16)
1,562.5 07 (0716)
366.2
15 (0F16)
1,464.8 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)
2,952.7 253 (FD16)
369.0 253 (FD16)
92.2 253 (FD16)
11.5
254 (FE16)
2,941.1 254 (FE16)
367.6 254 (FE16)
91.9 254 (FE16)
11.4
255 (FF16)
2,929.7 255 (FF16)
366.2 255 (FF16)
91.6 255 (FF16)
11.4
Notes 1: Select the UART clock prescaling with bits 1 and 2 of UART mode register.
2: Equation of transfer bit rate:
Transfer bit rate (bps) =
fi^✽
(BRG setting value + 1) ✕ 16
✽ : fi is selectable among φ/1, φ/8, φ/32, and φ/256 with bits 1 and 2 of UART mode register.
Rev.2.00 Aug 28, 2006 page 46 of 202
REJ09B0133-0200