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The method of calculating the value 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 12-6 Examples of BRR Settings for Bit Rate B (bit/s) (When n = 0)
bit/s
N Error N Error N Error N Error N Error N Error N Error
9600
0
Table 12-7 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
The bit rate error is given by the following formula:
Error (%) = (
1488 × 2
× 10
6
– 1
7.1424
10.00
0.00
1
30
Maximum Bit Rate (bit/s)
9600
13441
14400
17473
19200
21505
24194
ø
× B × (N + 1)
2n–1
ø (MHz)
10.7136
13.00
1
25
1
8.99
× 10
– 1) × 100
6
14.2848
16.00
1
0.00
1
12.01 2
N
n
0
0
0
0
0
0
0
0
0
0
0
0
0
0
18.00
15.99
401
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