SH7750_08 Datasheet, PDF (872/1162 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 17 Smart Card Interface
Pck = Peripheral module operating frequency (MHz)
n = 0 to 3 (See table 17.4)
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.7.00 Oct. 10, 2008 Page 788 of 1074
REJ09B0366-0700