385
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
2n–1
×
B
×
10
6
– 1
φ
Table 13.6
BRR Settings for Typical Bit Rates (bits/s) (When n = 0)
φ
(MHz)
7.1424
10.00
10.7136
13.00
14.2848
16.00
18.00
25.0
bit/s
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
3 12.49
Table 13.7
Maximum Bit Rates for Various Frequencies (Smart Card Interface Mode)
φ
(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 equation:
Error (%) =
1488
×
2
2n-1
×
B
×
(N + 1)
×
10
6
– 1
×
100
φ
Summary of Contents for H8/3008
Page 1: ...Hitachi 16 Bit Microcomputer H8 3008 Hardware Manual ADE 602 221 Rev 1 0 9 14 00 Hitachi Ltd ...
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