Technical Data
MC68HC11E Family
—
Rev. 4
158
Serial Communications Interface (SCI)
MOTOROLA
Serial Communications Interface (SCI)
Table 7-1. Baud Rate Values
Prescale
Divide
Baud
Set
Divide
Crystal Frequency (MHz)
4.9152
8.00
Bus Frequency (MHz)
1.23
2.00
76800
38400
19200
9600
4800
2400
1200
600
977
25600
12800
6400
3200
1600
800
400
200
326
19200
9600
4800
2400
1200
600
300
150
244
5908
2954
1477
738
369
185
92
46
75
1969
985
492
246
123
62
31
15
25
4.00
10.00
12.00
16.00
Prescaler Selects
SCP2 SCP1 SCP0 SCR2 SCR1 SCR0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
0
0
1.00
62500
31250
15625
7813
3906
1953
977
488
20833
10417
5208
2604
1302
651
326
163
15625
7813
3906
1953
977
488
244
122
4808
2404
1202
601
300
150
75
38
1603
801
401
200
100
50
25
13
2.50
156250
78125
39063
19531
9766
4883
2441
1221
52083
26042
13021
6510
3255
1628
814
407
39063
19531
9766
4883
2441
1221
610
305
12019
6010
3005
1502
751
376
188
94
4006
2003
1002
501
250
125
63
31
3.00
187500
93750
46875
23438
11719
5859
2930
1465
62500
31250
15625
7813
3906
1953
977
488
46875
23438
11719
5859
2930
1465
732
366
14423
7212
3606
1803
901
451
225
113
4808
2404
1202
601
300
150
75
38
4.00
250000
125000
62500
31250
15625
7813
3906
1953
83333
41667
20833
10417
5208
2604
1302
651
62500
31250
15625
7813
3906
1953
977
488
19231
9615
4808
2404
1202
601
300
150
6410
3205
1603
801
401
200
100
50
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
13
13
13
13
13
13
13
13
39
39
39
39
39
39
39
39
1
2
4
8
16
32
64
128
1
2
4
8
16
32
64
128
1
2
4
8
16
32
64
128
1
2
4
8
16
32
64
128
1
2
4
8
16
32
64
128
125000
62500
31250
15625
7813
3906
1953
0
0
0
0
0
0
0
1
1
1
1
1
1
1
41667
20833
10417
5208
2604
1302
651
1
1
1
1
1
1
1
0
0
0
0
0
0
0
31250
15625
7813
3906
1953
977
488
1
1
1
1
1
1
1
1
1
1
1
1
1
1
9615
4808
2404
1202
601
300
150
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3205
1603
801
401
200
100
50
Shaded areas reflect standard baud rates.
On MC68HC(7)11E20 do not set SCP1 or SCP0 when SCP2 is 1.