Renesas SH7709S 用户手册
Rev. 5.00, 09/03, page 499 of 760
Table 15.4
Relationship of n to CKS1 and CKS0
n
CKS1
CKS0
0
0
0
1
0
1
2
1
0
3
1
1
Table 15.5
Examples of Bit Rate B (Bits/s) for SCBRR Settings (n
====
0)
P
φφφφ
(MHz)
N
7.1424
10.00
10.7136
13.00
14.2848
16.00
18.00
0
9600.0
13440.9
14400.0
17473.1
19200.0
21505.4
24193.5
1
4800.0
6720.4
7200.0
8736.6
9600.0
10752.7
12096.8
2
3200.0
4480.3
4800.0
5824.4
6400.0
7168.5
8064.5
Note:
The bit rate is rounded to one decimal place.
Calculate the value to be set in the bit rate register (SCBRR) from the operating frequency and the
bit rate. N is an integer in the range 0
bit rate. N is an integer in the range 0
≤
N
≤
255, specifying a smallish error.
N =
×
10
6
−
1
1488
×
2
2n
−
1
×
B
P
φ
Table 15.6
Examples of SCBRR Settings for Bit Rate B (Bits/s) (n
====
0)
φφφφ
(MHz) (9600 Bits/s)
7.1424
10.00
10.7136
13.00
14.2848
16.00
18.00
N
Error
N
Error
N
Error
N
Error
N
Error
N
Error
N
Error
0
0.00
1
30.00
1
25.00
1
8.99
1
0.00
1
12.01
2
15.99