Renesas H8S Series Hardware Manual page 556

Table 15-5 Examples of Bit Rate B (bit/s) for Various BRR Settings (When n = 0)
N
0
1
2
Note: Bit rates are rounded to the nearest whole number.
The method of calculating the value to be set in the bit rate register (BRR) from the operating frequency and bit rate, on
the other hand, is shown below. N is an integer, 0 ≤ N ≤ 255, and the smaller error is specified.
ø
N =
1488 × 2 × B
2n–1
Table 15-6 Examples of BRR Settings for Bit Rate B (bit/s) (When n = 0)
7.1424
bit/s N Error N Error N Error N Error N Error N Error N Error N Error
9600 0
Table 15-7 Maximum Bit Rate at Various Frequencies (Smart Card Interface Mode)
ø (MHz)
7.1424
10.00
10.7136
13.00
14.2848
16.00
18.00
20.00
The bit rate error is given by the following formula:
Error (%) = (
1488 × 2
Rev.6.00 Oct.28.2004 page 528 of 1016
REJ09B0138-0600H
10.00 10.714
13441 14400
6720 7200
4480 4800
× 10
6
– 1
10.00 10.7136
0.00 1 30 1 25
Maximum Bit Rate (bit/s)
9600
13441
14400
17473
19200
21505
24194
26882
ø
× B × (N + 1)
2n–1
ø (MHz)
13.00 14.285
17473 19200
8737 9600
5824 6400
ø (MHz)
13.00 14.2848
1 8.99 1 0.00
× 10 – 1) × 100
6
16.00 18.00
21505 24194
10753 12097
7168 8065
16.00 18.00
1 12.01 2 15.99 2
N n
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
20.00
26882
13441
8961
20.00
6.60