SH7751 Datasheet, PDF (830/1224 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

17. Smart Card Interface
Table 17.4 Values of n and Corresponding CKS1 and CKS0 Settings
n
CKS1
CKS0
0
0
0
1
0
1
2
1
0
3
1
1
Table 17.5 Examples of Bit Rate B (bits/s) for Various SCBRR1 Settings (When n = 0)
Pck (MHz)
N
7.1424 10.00
10.7136 14.2848 25.0
0
9600.0 13440.9 14400.0 19200.0 33602.2
1
4800.0 6720.4 7200.0 9600.0 16801.1
2
3200.0 4480.3 4800.0 6400.0 11200.7
Note: Bit rates are rounded to one decimal place.
33.0
44354.8
22177.4
14784.9
50.0
67204.3
33602.2
22401.4
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.
N
=
1488
Pck
× 2²ⁿ
–
1
×
B
×
10⁶
–
1
Table 17.6 Examples of SCBRR1 Settings for Bit Rate B (bits/s) (When n = 0)
Bits/s
9600
7.1424
N Error
0 0.00
10.00
N Error
1 30.00
10.7136
N Error
1 25.00
Pck (MHz)
14.2848
25.00
N Error N Error
1 8.99 3 14.27
33.00
N Error
4 8.22
50.00
N Error
6 0.01
Rev.4.00 Oct. 10, 2008 Page 732 of 1122
REJ09B0370-0400