P87LPC768FD datasheet(44/64 Pages) PHILIPS

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Philips Semiconductors

Preliminary data

87LPC768

Low power, low price, low pin count (20 pin) microcontroller

with 4 kB OTP 8-bit A/D, Pulse Width Modulator

2001 Aug 06

Table 12. Baud Rates, Timer Values, and CPU Clock Frequencies for SMOD1 = 1

Timer Co nt

Baud Rate

Timer Count

2400

4800

9600

19.2k

38.4k

57.6k

115.2k

–1

0.2304

0.4608

0.9216

* 1.8432

* 3.6864

5.5296

* 11.0592

–2

0.4608

0.9216

* 1.8432

* 3.6864

* 7.3728

* 11.0592

–

–3

0.6912

1.3824

2.7648

5.5296

* 11.0592

16.5888

–

–4

0.9216

* 1.8432

* 3.6864

* 7.3728

* 14.7456

–

–5

1.1520

2.3040

4.6080

9.2160

* 18.4320

–

–6

1.3824

2.7648

5.5296

* 11.0592

–

–7

1.6128

3.2256

6.4512

12.9024

–

–8

* 1.8432

* 3.6864

* 7.3728

* 14.7456

–

–9

2.0736

4.1472

8.2944

16.5888

–

–10

2.3040

4.6080

9.2160

* 18.4320

–

–11

2.5344

5.0688

10.1376

–

–12

2.7648

5.5296

* 11.0592

–

–13

2.9952

5.9904

11.9808

–

–14

3.2256

6.4512

12.9024

–

–15

3.4560

6.9120

13.8240

–

–16

* 3.6864

* 7.3728

* 14.7456

–

–17

3.9168

7.8336

15.6672

–

–18

4.1472

8.2944

16.5888

–

–19

4.3776

8.7552

17.5104

–

–20

4.6080

9.2160

* 18.4320

–

–21

4.8384

9.6768

19.3536

–

NOTES TO TABLES 11 AND 12:

1. Tables 6 and 7 apply to UART modes 1 and 3 (variable rate modes), and show CPU clock rates in MHz for standard baud rates from 2400 to

115.2k baud.

2. Table 6 shows timer settings and CPU clock rates with the SMOD1 bit in the PCON register = 0 (the default after reset), while Table 7

reflects the SMOD1 bit = 1.

3. The tables show all potential CPU clock frequencies up to 20 MHz that may be used for baud rates from 9600 baud to 115.2k baud. Other

CPU clock frequencies that would give only lower baud rates are not shown.

4. Table entries marked with an asterisk (*) indicate standard crystal and ceramic resonator frequencies that may be obtained from many

sources without special ordering.

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