7477 datasheet(133/354 Pages) RENESAS

Part #	7477

Description	8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES

PDF	354 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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HARDWARE

1-116

7470/7471/7477/7478 GROUP USER’S MANUAL

1.13 Serial I/O

The BRG is an 8-bit counter dedicated to the Serial I/O, having a reload register, and divides the

count source by (n + 1) by setting the value n. As a count source, f(XIN)/4 (at “0”), f(XIN)/16 (at

“1”) can be selected by bit 0 of the Serial I/O control register. In the 7478 Group, f(XCIN)/4 (at “0”),

f(XCIN)/16 (at “1”), can be also selected.

Table 1.13B.3 shows a baud rate reference value.

Table 1.13B.3 Baud rate reference value

BRG set value

Count source

Baud rate [bps]

Count source

BRG set value

f(XIN)/16

f(XIN)/4

300

600

1200

2400

4800

9600

15600

31200

41600

f(XIN)/16

f(XIN)/4

51(3316 )

25(1916 )

12(0C16)

25(1916 )

12(0C16)

103(6716 )

51(3 316 )

25(1916 )

12(0C16)

25(1916 )

12(0C16)

7(0716 )

3(0316 )

2(0216 )

At f(XIN) = 7.9872 MHz

At f(XIN) = 3.9936 MHz

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