Renesas ZTAT H8S/2357F, Hardware Manual

Page: 556 / 1047

Rev.6.00 Oct.28.2004 page 528 of 1016
REJ09B0138-0600H
Table 15-5 Examples of Bit Rate B (bit/s) for Various BRR Settings (When n = 0)
ø (MHz)
N 10.00 10.714 13.00 14.285 16.00 18.00 20.00
0 13441 14400 17473 19200 21505 24194 26882
1 6720 7200 8737 9600 10753 12097 13441
2 4480 4800 5824 6400 7168 8065 8961
Note: Bit rates are rounded to the nearest whole number.
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 =
ø
1488
×
2
2n–1
×
B
×
10
6
– 1
Table 15-6 Examples of BRR Settings for Bit Rate B (bit/s) (When n = 0)
ø (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 15-7 Maximum Bit Rate at Various Frequencies (Smart Card Interface Mode)
ø (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 (%) = (
ø
1488
×
2
2n–1
×
B
×
(N + 1)
×
10
6
– 1)
×
100