M38047FEHKP datasheet(200/387 Pages) RENESAS

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APPLICATION

2.4 Serial interface

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

BRG count source

BRG setting value

Transfer bit rate (bps) (Note 2)

(Note 1)

at f(XIN) = 4.9152 MHZ

at f(XIN) = 16 MHZ

f(XIN)/4

255(FF16)

300

976.5625

f(XIN)/4

127(7F16)

600

1953.125

f(XIN)/4

63(3F16)

1200

3906.25

f(XIN)/4

31(1F16)

2400

7812.5

f(XIN)/4

15(0F16)

4800

15625

f(XIN)/4

7(0716)

9600

31250

f(XIN)/4

3(0316)

19200

62500

f(XIN)/4

1(0116)

38400

125000

f(XIN)

3(0316)

76800

250000

f(XIN)

1(0116)

153600

500000

f(XIN)

0(0016)

307200

1000000

Notes 1: Select the BRG count source with bit 0 of the serial I/O1 control register (Address : 001A16).

2: Equation of transfer bit rate:

✽m: When bit 0 of the serial I/O1 control register (Address : 001A16) is set to “0,” a value of

m is 1.

When bit 0 of the serial I/O1 control register (Address : 001A16) is set to “1,” a value of

m is 4.

Table 2.4.4 shows setting examples of the baud rate generator (BRG) values and transfer bit rate

values; Figure 2.4.40 shows registers setting relevant to the transmitting side; Figure 2.4.41 shows

registers setting relevant to the receiving side.

Table 2.4.4 Setting examples of Baud rate generator (BRG) values and transfer bit rate values

Transfer bit rate (bps) =

(BRG setting value + 1) ✕ 16 ✕ m✽

f(XIN)

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