HD64F3039F18 Datasheet, PDF (428/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 12 Smart Card Interface
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.
N=
φ
× 10⁶ – 1
1488 × 2^2n–1 × B
Table 12.6 Examples of BRR Settings for Bit Rate B (bit/s) (When n = 0)
bit/s
9600
7.1424
N Error
0 0.00
10.00
N Error
1 30
10.7136
N Error
1 25
φ (MHz)
13.00
N Error
1 8.99
14.2848
N Error
1 0.00
16.00
N Error
1 12.01
18.00
N Error
2 15.99
Table 12.7 Maximum Bit Rate at Various Frequencies (Smart Card Interface Mode)
φ (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
The bit rate error is given by the following formula:
Error (%) = (
φ
× 10⁶ – 1) × 100
1488 × 2^2n–1 × B × (N + 1)
Rev.3.00 Mar. 26, 2007 Page 404 of 682
REJ09B0353-0300