STC89LE53RC datasheet(96/165 Pages) STC

96 / 165 page

Example: write a program using Timer 1 to create a 500Hz square wave on P1.0.

Assembly Language Solution:

ORG

0030H

MOV

TMOD, #10H

;16-bit timer mode

MOV

TH1,

#0F8H

;-1000 (high byte)

MOV

TH1,

#30H

;-1000 (low byte)

SETB

TR1

;Start Tmier 1

LOOP:

JNB

TF1,

LOOP

;Wait for overflow

CLR

TF1

;Clear Timer overflow flag

CPL

P1.0

;Toggle port bit

SJMP

LOOP

;Repeat

END

C Language Solution :

#include <REG51.H>

/* SFR declarations */

sbit

portbit = P1^0;

/* Use variable portbit to refer to P1.0 */

main( )

{

TMOD = 0x10;

/* timer 1, mode 1, 16-bit timer mode */

while (1)

/* repeat forever */

{

TH1 = 0xF8;

/* -1000 (high byte) */

TL1 = 0x30;

/* -1000 (low byte) */

TR1 = 1;

/* Start timer 1 */

while (TF0 !=1);

/* wait for overflow */

TR1 = 0;

/* stop timer 1 */

TF0 = 0;

/* clear timer overflow flag */

portbit = !(portbit);

/* toggle P1.0 */

}

Mode 2

Mode 2 configures the timer register as an 8-bit counter(TL1) with automatic reload. Overflow from TL1 not

only set TFx, but also reload TL1 with the content of TH1, which is preset by software. The reload leaves TH1

unchanged.

Interrupt

SYSclk

TF1

control

C/T=0

C/T=1

T1 Pin

TR1

GATE

INT1

MCU in 12T mode

MCU in 6T mode

TL1

(8 Bits)

TH1

(8 Bits)

Timer/Counter 1 Mode 2: 8-Bit Auto-Reload

÷12

÷6

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