Table 17.5 Examples of Bit Rate B (bits/s) for Various SCBRR1 Settings (When n = 0)
Pφ (MHz)
N
0
1
2
7.1424
9600.0
4800.0
3200.0
10.00
10.7136
14400.0
7200.0
4800.0
14.2848
19200.0
9600.0
6400.0
25.0
33.0
50.0
13440.9
6720.4
4480.3
33602.2
16801.1
11200.7
44354.8
22177.4
14784.9
67204.3
33602.2
22401.4
Note: Bit rates are rounded to one decimal place.
The method of calculating the value to be set in the bit rate register (SCBRR1) from the peripheral
module operating frequency and bit rate is shown below. Here, N is an integer in the range 0 ≤ N ≤
255, and the smaller error is specified.
P
φ
N =
× 106 – 1
1488 × 22n–1 × B
Table 17.6 Examples of SCBRR1 Settings for Bit Rate B (bits/s) (When n = 0)
Pφ (MHz)
7.1424
Error
0.00
10.00
Error
30.00
10.7136
Error
14.2848
Error
8.99
25.00
Error
14.27
33.00
Error
8.22
50.00
Error
0.01
Bits/s
N
N
N
N
N
N
N
9600
0
1
1
25.00
1
3
4
6
Table 17.7 Maximum Bit Rate at Various Frequencies (Smart Card Interface Mode)
Pφ (MHz)
7.1424
10.00
10.7136
16.00
20.00
25.0
Maximum Bit Rate (bits/s)
N
0
0
0
0
0
0
0
0
0
n
0
0
0
0
0
0
0
0
0
19200
26882
28800
43010
53763
67204
80645
88710
67204
30.0
33.0
50.0
Rev. 6.0, 07/02, page 716 of 986
RENESAS [ RENESAS TECHNOLOGY CORP ]
