HD6432351 datasheet(661/1025 Pages) RENESAS

661 / 1025 page

Section 14 Smart Card Interface

Rev. 3.00 Sep 15, 2006 page 627 of 988

REJ09B0330-0300

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 =

1488

× 22n

–1 × B

× 106 – 1

Table 14.6 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 14.7 Maximum Bit Rate at Various Frequencies (Smart Card Interface Mode)

φφφφ (MHz)

Maximum Bit Rate (bit/s)

7.1424

9600

10.00

13441

10.7136

14400

13.00

17473

14.2848

19200

16.00

21505

18.00

24194

20.00

26882

The bit rate error is given by the following formula:

Error (%) = (

1488

× 22n

–1 × B × (N + 1)

× 106 – 1) × 100

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