7733 datasheet(249/940 Pages) RENESAS

249 / 940 page

SERIAL I/O

7733 Group User’s Manual

8–46

8.4 Clock asynchronous serial I/O (UART) mode

Table 8.4.3 Example of baud rate setting (1)

System clock: 19.6608 MHz

System clock: 14.7456 MHz

Baud rate

(bps)

300

600

1200

2400

4800

9600

19200

38400

57600

115200

BRGi’s

countsource

f16

BRGi’s set value: n

191 (BF16)

95 (5F16)

47 (2F16)

191 (BF16)

95 (5F16)

47 (2F16)

23 (1716)

11 (0B16)

7 (0716)

3 (0316)

Actual time (bps)

300.00

600.00

1200.00

2400.00

4800.00

9600.00

19200.00

38400.00

57600.00

115200.00

BRGi’s set value: n

255 (FF16)

127 (7F16)

63 (3F16)

255 (FF16)

127 (7F16)

63 (3F16)

31 (1F16)

15 (F16)

Actual time (bps)

300.00

600.00

1200.00

2400.00

4800.00

9600.00

19200.00

38400.00

System clock, and clocks f2, f16: Refer to chapter “14. CLOCK GENERATING CIRCUIT.”

Note: This is applied when the system clock selection bit (bit 3 at address 6C16) = “0.”

For details, refer to chapter “14. CLOCK GENERATING CIRCUIT.”

Table 8.4.4 Example of baud rate setting (2)

System clock: 25 MHz

System clock: 24.576 MHz

Baud rate

(bps)

300

600

1200

2400

4800

9600

14400

19200

31250

BRGi’s

countsource

f64

f16

BRGi’s set value: n

79 (4F16)

159 (9F16)

79 (4F16)

39 (2716)

159 (9F16)

79 (4F16)

52 (3416)

39 (2716)

Actual time (bps)

300.00

600.00

1200.00

2400.00

4800.00

9600.00

14490.57

19200.00

BRGi’s set value: n

80 (5016)

162 (A216)

80 (5016)

40 (2816)

162 (A216)

80 (5016)

53 (3516)

40 (2816)

24 (1816)

Actual time (bps)

301.41

599.12

1205.63

2381.86

4792.94

9645.06

14467.59

19054.88

31250.00

System clock, and clocks f2, f16, f64: Refer to chapter “14. CLOCK GENERATING CIRCUIT.”

Note: This is applied when the system clock selection bit (bit 3 at address 6C16) = “0.”

For details, refer to chapter “14. CLOCK GENERATING CIRCUIT.”

Table 8.4.5 Example of baud rate setting (3)

System clock: 12 MHz

System clock: 11.0592 MHz

Baud rate

(bps)

300

600

1200

2400

4800

9600

14400

19200

28800

31250

BRGi’s

countsource

f16

BRGi’s set value: n

143 (8F16)

71 (4716)

35 (2316)

143 (8F16)

71 (4716)

35 (2316)

24 (1816)

17 (1116)

12 (0C16)

Actual time (bps)

300.00

600.00

1200.00

2400.00

4800.00

9600.00

14400.00

19200.00

28800.00

BRGi’s set value: n

155 (9B16)

77 (4D16)

38 (2616)

155 (9B16)

77 (4D16)

38 (2616)

26 (1A16)

13 (0D16)

11 (0B16)

Actual time (bps)

300.48

600.96

1201.92

2403.85

4807.69

9615.38

14423.08

28846.15

31250.00

System clock, and clocks f2, f16: Refer to chapter “14. CLOCK GENERATING CIRCUIT.”

Note: This is applied when the system clock selection bit (bit 3 at address 6C16) = “0.”

For details, refer to chapter “14. CLOCK GENERATING CIRCUIT.”

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