BLUENRG-2 datasheet(71/190 Pages) STMICROELECTRONICS

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BlueNRG-2

Functional details

DocID030675 Rev 2

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An internal clock enable signal, Baudl6, is generated, and is a stream of one UARTCLK

wide pulses with an average frequency of 16 (OVSFACT = 0b) or 8 (OVSFACT = 1b) times

the desired baud rate. This signal is then divided by 16 or 8 to give the transmit clock. A

low number in the baud rate divisor gives a short bit period, and a high number in the baud

rate divisor gives a long bit period.

Table 72: "Typical baud rates with OVSFACT = 0" shows some typical bit rates and their

corresponding divisors when OVSFACT = 0b, given the UART clock frequency of 16 MHz.

Table 72: Typical baud rates with OVSFACT = 0

Required bit rate

(bps)

Programmed divisor

Generated bit rate

(bps)

Error

(%)

Integer

(DIVINT)

Fraction

(DIVFRAC)

921 600

1 (16’h0001)

5 (6’h05)

927 557

0.646

460 800

2 (16’h0002)

11 (6’h0B)

460 447

- 0.077

230 400

4 (16’h0004)

22 (6’h16)

230 218

- 0.079

115 200

8 (16’h0008)

44 (6’h2C)

115 107

- 0.081

57 600

17 (16’h0011)

23 (6’h17)

57 606

0.010

38 400

26 (16’h001A)

3 (6’h03)

38 392

- 0.021

28 800

34 (16’h0022)

46 (6’h2E)

28 802

0.007

19 200

52 (16’h0034)

5 (6’h05)

19 201

0.005

9 600

104 (16’h0068)

11 (6’h0B)

9 599

- 0.010

2 400

416 (16’h01A0)

43 (6’h2B)

2 399

- 0.042

1 200

833 (16’h04B0)

21 (6’h15)

1 200

300

3333

(16’h0D05)

21 (6’h15)

300

110

9090

(16’h2382)

(6’h3A)

110

Table 73: Typical baud rates with OVSFACT = 1

Required bit rate

(bps)

Programmed divisor

Generated bit rate

(bps)

Error

(%)

Integer

(DIVINT)

Fraction

(DIVFRAC)

1 843 200

1 (16’h0001)

5 (6’h05)

1 855 115

0.646

921 600

2 (16’h0002)

(6’h0B)

920 895

- 0.076

460 800

4 (16’h0004)

22 (6’h16)

461 436

- 0.079

230 400

8 (16’h0008)

44 (6’h2C)

230 215

- 0.080

115 200

17 (16’h0011)

23 (6’h17)

115 212

0.010

57 600

34 (16’h0022)

46 (6’h2E)

57 605

0.009

38 400

52 (16’h0034)

5 (6’h05)

38 403

0.008

28800

69 (16’h0045)

28 (6’h1C)

28 802

0.007

19 200

104 (16’h0068)

11 (6’h0B)

19 199

- 0.005

9 600

208 (16’h00D0)

21 (6’h15)

9 600

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