Hitachi H8/3008 Hardware Manual page 353

Table 12.6 Maximum Bit Rates with External Clock Input (Asynchronous Mode)
φ (MHz)
2
2.097152
2.4576
3
3.6864
4
4.9152
5
6
6.144
7.3728
8
9.8304
10
12
12.288
14
14.7456
16
17.2032
18
20
25
External Input Clock (MHz)
0.5000
0.5243
0.6144
0.7500
0.9216
1.0000
1.2288
1.2500
1.5000
1.5360
1.8432
2.0000
2.4576
2.5000
3.0000
3.0720
3.5000
3.6864
4.0000
4.3008
4.5000
5.0000
6.2500
Maximum Bit Rate (bit/s)
31250
32768
38400
46875
57600
62500
76800
78125
93750
96000
115200
125000
153600
156250
187500
192000
218750
230400
250000
268800
281250
312500
390625
337