7480 datasheet(144/337 Pages) RENESAS

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7480 Group and 7481 Group User's Manual

1-127

1.14 Serial I/O

HARDWARE

Data Transfer Rate (Baud Rate)

In UART, the baud rate, which is the frequency of the synchronous clock, is calculated by the following

formulas.

• When the serial I/O synchronous clock selection bit is ‘0’:.

(BRG output/16 is selected as the synchronous clock.)

Baud rate [bps] =

Notes 1: BRG count source selection bit of the serial I/O control register is as follows:

• ‘0’: Division ratio is 4

• ‘1’: Division ratio is 16.

2: The value written to the baud rate generator (0016 to FF16).

• When the serial I/O synchronous clock selection bit is ‘1’

(the external clock/16 input is selected as the synchronous clock):

Baud rate [bps] =

Table 1.14.2 lists an example of baud rates.

Table 1.14.2 Example of Baud Rates

f(XIN) = 7.9872 MHz

f(XIN) = 3.9936 MHz

Baud Rate

[bps]

300

600

1200

2400

4800

9600

15600

31200

41600

Count Source

f(XIN)/16

f(XIN)/4

BRG Setting Value

103 (6716)

51 (3316)

25 (1916)

12 (0C16)

25 (1916)

12 (0C16)

7 (0716)

3 (0316)

2 (0216)

Count Source

f(XIN)/16

f(XIN)/4

BRG Setting Value

51 (3316)

25 (1916)

12 (0C16)

25 (1916)

12 (0C16)

f(XIN)

Division ratio (Note 1)

× (BRG setting value (Note 2) + 1) × 16

External clock input frequency from the SCLK pin

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