P80C32 datasheet(22/62 Pages) PHILIPS

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Philips Semiconductors

Product data

P80C3xX2; P80C5xX2;

P87C5xX2

80C51 8-bit microcontroller family

4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V),

low power, high speed (30/33 MHz)

2003 Jan 24

Table 5.

Timer 2 Generated Commonly Used

Baud Rates

Baud Rate

Timer 2

12-clk

mode

6-clk

mode

Osc Freq

RCAP2H

RCAP2L

375 K

750 K

12 MHz

9.6 K

19.2 K

12 MHz

4.8 K

9.6 K

12 MHz

2.4 K

4.8 K

12 MHz

1.2 K

2.4 K

12 MHz

300

600

12 MHz

110

220

12 MHz

300

600

6 MHz

110

220

6 MHz

Summary Of Baud Rate Equations

Timer 2 is in baud rate generating mode. If Timer 2 is being clocked

through pin T2(P1.0) the baud rate is:

Baud Rate

+ Timer 2 Overflow Rate

If Timer 2 is being clocked internally, the baud rate is:

Baud Rate

OSC

[65536

* (RCAP2H, RCAP2L)]]

Where:

n = 16 in 6-clock mode, 32 in 12-clock mode.

fOSC= Oscillator Frequency

To obtain the reload value for RCAP2H and RCAP2L, the above

equation can be rewritten as:

RCAP2H, RCAP2L

+ 65536 *

OSC

Baud Rate

Timer/Counter 2 Set-up

Except for the baud rate generator mode, the values given for

T2CON do not include the setting of the TR2 bit. Therefore, bit TR2

must be set, separately, to turn the timer on. See Table 6 for set-up

of Timer 2 as a timer. Also see Table 7 for set-up of Timer 2 as a

counter.

Table 6. Timer 2 as a Timer

T2CON

MODE

INTERNAL

CONTROL

(Note 1)

EXTERNAL

CONTROL

(Note 2)

16-bit Auto-Reload

00H

08H

16-bit Capture

01H

09H

Baud rate generator receive

and transmit same baud rate

34H

36H

Receive only

24H

26H

Transmit only

14H

16H

Table 7. Timer 2 as a Counter

TMOD

MODE

INTERNAL

CONTROL

(Note 1)

EXTERNAL

CONTROL

(Note 2)

16-bit

02H

0AH

Auto-Reload

03H

0BH

NOTES:

1. Capture/reload occurs only on timer/counter overflow.

2. Capture/reload occurs on timer/counter overflow and a 1-to-0

transition on T2EX (P1.1) pin except when Timer 2 is used in the

baud rate generator mode.

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