Hitachi H8/3062 Hardware Manual page 449

The following equation calculates the bit rate register (BRR) setting from the operating frequency
and bit rate. N is an integer from 0 to 255, specifying the value with the smaller error.
N =
1488 × 2
Table 13.6 BRR Settings for Typical Bit Rates (bits/s) (When n = 0)
7.1424
bit/s N Error N Error
9600 0 0.00 1 30
Table 13.7 Maximum Bit Rates for Various Frequencies (Smart Card Interface Mode)
φ (MHz)
7.1424
10.00
10.7136
13.00
14.2848
16.00
18.00
20.00
25.00
The bit rate error is given by the following equation:
Error (%) =
φ
× 10
6
× B
2n–1
10.00 10.7136
N Error
1 25
Maximum Bit Rate (bits/s)
9600
13441
14400
17473
19200
21505
24194
26882
33602
φ
1488 × 2 × B × (N + 1)
2n-1
– 1
φ (MHz)
13.00 14.2848
N Error N Error
1 8.99 1 0.00
N
0
0
0
0
0
0
0
0
0
× 10
6
– 1
16.00 18.00
N Error N Error
1 12.01 2 15.99
n
0
0
0
0
0
0
0
0
0
× 100
25.0
N Error
3 12.49
431