38K2 datasheet(210/358 Pages) RENESAS

210 / 358 page

2.4 Serial I/O

Rev.2.00

Oct 15, 2006

page 61 of 112

38K2 Group

REJ09B0338-0200

APPLICATION

Notes 1: Select the BRG count source with bit 0 of the serial I/O control register (Address : 0FE016).

2: These are setting values with small errors.

3: Equation of transfer bit rate:

✽m: When bit 0 of the serial I/O control register (Address : 0FE016) is set to “0”, a value of m

is 1.

When bit 0 of the serial I/O control register (Address : 0FE016) is set to “1”, a value of

m is 4.

Table 2.4.1 shows setting examples of the baud rate generator (BRG) values and transfer bit rate

values; Figure 2.4.31 shows registers setting related to the transmitting side; Figure 2.4.32 shows

registers setting related to the receiving side.

Table 2.4.1 Setting examples of Baud rate generator values and transfer bit rate values

Transfer bit rate (bps) =

(BRG setting value + 1) ✕ 16 ✕ m✽

f(XIN)

Transfer bit rate

(bps) (Note 3)

600

1200

2400

4800

9600

14400

19200

38400

57600

BRG count source

(Note 1)

f(XIN)/4

f(XIN)

At f(XIN) = 6 MHZ

BRG setting value (Note 2)

155

–

At f(XIN) = 8 MHZ

BRG setting value (Note 2)

207

103

207

103

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