Rev. 5.00, 12/03, page 503 of 1088
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.
N =
φ
S
×
2
2n+1
×
B
×
10
6
– 1
Table 13-6 Examples of BRR Settings for Bit Rate B (bits/s) (When n = 0 and S = 372)
φφφφ
(MHz)
7.1424
10.00
10.7136
13.00
14.2848
16.00
18.00
20.00
25.00
Bits/s
N
Error N
Error N
Error N
Error N
Error N
Error N
Error N
Error N
Error
9600
0
0.00
1
30
1
25
1
8.99
1
0.00
1
12.01 2
15.99 2
6.60
3
12.49
Table 13-7 Maximum Bit Rate at Various Frequencies (Smart Card Interface Mode)
(When S = 372)
φφφφ
(MHz)
Maximum Bit Rate (bits/s)
N
n
7.1424
9600
0
0
10.00
13441
0
0
10.7136
14400
0
0
13.00
17473
0
0
14.2848
19200
0
0
16.00
21505
0
0
18.00
24194
0
0
20.00
26882
0
0
25.00
33602
0
0
The bit rate error is given by the following formula:
Error (%) = (
φ
S
×
2
2n+1
×
B
×
(N + 1)
×
10
6
– 1)
×
100
Содержание H8S/2318 series
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