HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 714

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 15 Smart Card Interface
15.3.5
Only an internal clock generated by the built-in 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,
CKS0, BCP1, and BCP0 bits in SMR. The formula for calculating the bit rate is as shown below.
Table 15.5 shows some sample bit rates.
If clock output is selected by setting CKE0 to 1, the clock is output from the SCK pin. The clock
frequency is determined by the bit rate and the setting of bits BCP1 and BCP0.
Where: N = Value set in BRR (0 ≤ N ≤ 255)
Table 15.4 Correspondence between n and CKS1, CKS0
n
0
1
2
3
Table 15.5 Examples of Bit Rate B (bits/s) for Various BRR Settings
N
0
1
2
Note: Bit rates are rounded to the nearest whole number.
Rev.6.00 Sep. 27, 2007 Page 684 of 1268
REJ09B0220-0600
B = Bit rate (bits/s)
φ = Operating frequency (MHz)
n = See table 15.4
S = Number of internal clock cycles in 1-bit period set by bits BCP1 and BCP0
B =
Clock
(When n = 0 and S = 372)
CKS1
0
1
S × 2
10.00
13441
6720
4480
2n+1
φ
× (N + 1)
CKS0
0
1
0
1
10.714
14400
7200
4800
× 10
13.00
17473
8737
5824
6
14.285 16.00
19200
9600
6400
φ (MHz)
21505
10753
7168
18.00
24194
12097
8065
20.00
26882
13441
8961
25.00
33602
16801
11201