3886 datasheet(185/380 Pages) RENESAS

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3886 Group User’s Manual

APPLICATION

2.4 Serial I/O

BRG count source

BRG setting value

Transfer bit rate (bps) (Note 2)

(Note 1)

at f(XIN) = 4.9152 MHZ

at f(XIN) = 8 MHZ

f(XIN)/4

255(FF16)

300

488.28125

f(XIN)/4

127(7F16)

600

976.5625

f(XIN)/4

63(3F16)

1200

1953.125

f(XIN)/4

31(1F16)

2400

3906.25

f(XIN)/4

15(0F16)

4800

7812.5

f(XIN)/4

7(0716)

9600

15625

f(XIN)/4

3(0316)

19200

31250

f(XIN)/4

1(0116)

38400

62500

f(XIN)

3(0316)

76800

125000

f(XIN)

1(0116)

153600

250000

f(XIN)

0(0016)

307200

500000

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

2: Equation of transfer bit rate:

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

is 1.

When bit 0 of the serial I/O1 control register (Address : 1A16) 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 2.4.39 shows registers setting relevant to the transmitting side; Figure 2.4.40 shows

registers setting relevant 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)

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