HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 456

• Manufacturer Part Number: HD6417706
• Description: Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

15.4.5
Only the internal clock generated by the on-chip baud rate generator can be used as the
communication clock in the smart card interface. The bit rate for the clock is set by the SCBRR
and the CKS1 and CKS0 bits in the SCSMR, and is calculated using the equation below. Table
15.4 shows sample bit rates. If clock output is then selected by setting CKE0 to 1, a clock with a
frequency 372 times the bit rate is output from the SCK0 pin.
Where:
N
B
P
n
Table 15.3 Relationship of n to CKS1 and CKS0
Table 15.4 Examples of Bit Rate B (Bit/s) for SCBRR Settings (n
Note: The bit rate is rounded to two decimal places.
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
Rev. 4.00, 03/04, page 410 of 660
n
0
1
2
3
N
0
1
2
0 to 3 (table 15.3)
Value set in SCBRR (0
Bit rate (bit/s)
Peripheral module operating frequency (MHz)
N =
B =
Clock
7.1424
9600.0
4800.0
3200.0
1488
1488
P
2
2
2n–1
2n–1
P
10.00
13440.9
6720.4
4480.3
(N + 1)
B
N
10
CKS1
0
0
1
1
255)
6
– 1
10.7136
14400.0
7200.0
4800.0
10
N
6
255, specifying a smallish error.
13.00
17473.1
8736.6
5824.4
P (MHz)
14.2848
19200.0
9600.0
6400.0
CKS0
0
1
0
1
0)
16.00
21505.4
10752.7
7168.5
12096.8
18.00
24193.5
8064.5