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8051 timer to sleep for a few second

Ivan Cheung over 21 years ago

Does anybody know how to set 8051 timer to sleep for a few second and then wake up by itself?

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0 Jon Ward over 21 years ago in reply to Ivan Cheung

Well, it probably helps to show the whole section of code so that the comment really makes sense.

/*------------------------------------------------
Setup TIMER0 to generate a regular interupt.
------------------------------------------------*/
TR0 = 0;           /* Stop Timer 0 */

TMOD &= ~0x0F;     /* 16-bit, no prescale mode */
TMOD |=  0x01;

TL0 = 0;           /* Set T0 */
TH0 = 0;

PT0 = 0;           /* Low Priority Interrupt */
ET0 = 1;           /* Enable Timer0 Interrupt */

TR0 = 1;           /* Start Timer 0 */
EA = 1;            /* Enable Global Interrupts */

TMOD is the Timer MODE Register. It is documented in the 8051 data sheet.

Jon

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0 Jon Ward over 21 years ago in reply to Ivan Cheung

Well, it probably helps to show the whole section of code so that the comment really makes sense.

/*------------------------------------------------
Setup TIMER0 to generate a regular interupt.
------------------------------------------------*/
TR0 = 0;           /* Stop Timer 0 */

TMOD &= ~0x0F;     /* 16-bit, no prescale mode */
TMOD |=  0x01;

TL0 = 0;           /* Set T0 */
TH0 = 0;

PT0 = 0;           /* Low Priority Interrupt */
ET0 = 1;           /* Enable Timer0 Interrupt */

TR0 = 1;           /* Start Timer 0 */
EA = 1;            /* Enable Global Interrupts */

TMOD is the Timer MODE Register. It is documented in the 8051 data sheet.

Jon

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