HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 530

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 13 Smart Card Interface
13.3.5
Only an internal clock generated by the on-chip baud rate generator can be used as the
transmit/receive clock for the smart card interface. The bit rate is set with BRR and the CKS1 and
CKS0 bits in SMR. The formula for calculating the bit rate is as shown below. Table 13.5 shows
some sample bit rates.
If clock output is selected by setting CKE0 to 1, a clock with a frequency of 372 times the bit rate
is output from the SCK pin.
Where N = Value set in BRR (0
Table 13.4 Correspondence between n and CKS1, CKS0
n
0
1
2
3
Table 13.5 Examples of Bit Rate B (bit/s) for Various BRR Settings (When n = 0)
N
0
1
2
Note: Bit rates are rounded to the nearest whole number.
Rev.3.00 Mar. 26, 2007 Page 488 of 772
REJ09B0355-0300
B = Bit rate (bit/s)
n = See table 13.4
B =
Clock
= Operating frequency (MHz)
1488
CKS1
0
1
10.00
13441
6720
4480
2
2n–1
(N + 1)
10.714
14400
7200
4800
N 255)
CKS0
0
1
0
1
10
6
13.00
17473
8737
5824
14.285
19200
9600
6400
(MHz)
16.00
21505
10753
7168
18.00
24194
12097
8065
20.00
26882
13441
8961