H8S2245 datasheet(530/818 Pages) RENESAS

tên linh kiện	H8S2245

Giải thích chi tiết về linh kiện	Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series

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Section 13 Smart Card Interface

Rev.3.00 Mar. 26, 2007 Page 488 of 772

REJ09B0355-0300

13.3.5

Clock

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.

B =

1488

× 22n–1 × (N + 1)

× 106

Where N = Value set in BRR (0

≤ N ≤ 255)

B = Bit rate (bit/s)

φ = Operating frequency (MHz)

n = See table 13.4

Table 13.4

Correspondence between n and CKS1, CKS0

CKS1

CKS0

Table 13.5

Examples of Bit Rate B (bit/s) for Various BRR Settings (When n = 0)

φφφφ (MHz)

10.00

10.714

13.00

14.285

16.00

18.00

20.00

13441

14400

17473

19200

21505

24194

26882

6720

7200

8737

9600

10753

12097

13441

4480

4800

5824

6400

7168

8065

8961

Note:

Bit rates are rounded to the nearest whole number.

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