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H8S2245 Datasheet(PDF) 531 Page - Renesas Technology Corp

No. de pieza H8S2245
Descripción Electrónicos  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
PDF  818 Pages
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
Página de inicio  http://www.renesas.com
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H8S2245 Datasheet(HTML) 531 Page - Renesas Technology Corp

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Section 13 Smart Card Interface
Rev.3.00 Mar. 26, 2007 Page 489 of 772
REJ09B0355-0300
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
1488
× 22n–1 × B
× 106 – 1
Table 13.6
Examples of BRR Settings for Bit Rate B (bit/s) (When n = 0)
φφφφ (MHz)
7.1424
10.00
10.7136
13.00
14.2848
16.00
18.00
20.00
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
2
6.60
Table 13.7
Maximum Bit Rate at Various Frequencies (Smart Card Interface Mode)
φφφφ (MHz)
Maximum Bit Rate (bit/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
The bit rate error is given by the following formula:
Error (%) = (
φ
1488
× 22n–1 × B × (N + 1)
× 106 – 1) × 100



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