Freescale Semiconductor, Inc.
Serial Communications Interface (SCI)
Table 10-3. Baud Rate Selection Examples
SCI Baud Rate
SCP[1:0]
SCR[2:1:0]
f
= 2 MHz
f
= 4 MHz
f = 4.194304 MHz
OSC
OSC
OSC
00
00
00
00
00
00
00
00
01
01
01
01
01
01
01
01
10
10
10
10
10
10
10
10
11
11
11
11
11
11
11
11
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
62.50 Kbaud
31.25 Kbaud
15.63 Kbaud
7813 baud
3906 baud
1953 baud
976.6 baud
488.3 baud
20.83 Kbaud
10.42 Kbaud
5208 baud
2604 baud
1302 baud
651.0 baud
325.5 baud
162.8 baud
15.63 Kbaud
7813 baud
3906 baud
1953 baud
976.6 baud
488.3 baud
244.1 baud
122.1 baud
4808 baud
2404 baud
1202 baud
601.0 baud
300.5 baud
150.2 baud
75.12 baud
37.56 baud
125 Kbaud
131.1 Kbaud
65.54 Kbaud
32.77 Kbaud
16.38 Kbaud
8192 baud
4096 baud
2048 baud
1024 baud
43.69 Kbaud
21.85 Kbaud
10.92 Kbaud
5461 baud
2731 baud
1365 baud
682.7 baud
341.3 baud
32.77 Kbaud
16.38 Kbaud
8192 baud
4906 baud
2048 baud
1024 baud
512.0 baud
256.0 baud
10.08 Kbaud
5041 baud
2521 baud
1260 baud
630.2 baud
315.1 baud
157.5 baud
78.77 baud
62.50 Kbaud
31.25 Kbaud
15.63 Kbaud
7813 baud
3906 baud
1953 baud
976.6 baud
41.67 Kbaud
20.83 Kbaud
10.42 Kbaud
5208 baud
2604 baud
1302 baud
651.0 baud
325.5 baud
31.25 Kbaud
15.63 Kbaud
7813 baud
3906 baud
1953 baud
976.6 baud
488.3 baud
244.1 baud
9615 baud
4808 baud
2404 baud
1202 baud
601.0 baud
300.5 baud
150.2 baud
75.12 baud
Technical Data
138
MC68HC705C8A — Rev. 3
Serial Communications Interface (SCI)
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