Who provides the clock pulses to 8051 timers?
The C/T bit in the TMOD registers decides the source of the clock for the timer. When C/T = 1, the timer is used as acounter and gets its pulses from outsidethe 8051, the counter counts up as pulses are fed frompins 14 and 15, these pins are called T0 (timer0 input) and T1 (timer 1 input).
What is the source of clock pulse when timer 0 is used as counter?
If Timer 0 is to be used as a counter, then at what particular pin clock pulse need to be applied? Solution: If Timer 0 is to be used as a counter, then a pulse has to be applied at P3. 4 and if it is for Timer 1 then the clock pulse has to be applied at the pin P3.
What is the clock source for the timers in 8051?
This set of 8051 Micro-controller Multiple Choice Questions & Answers (MCQs) focuses on “I/O Port Programming and Addressing Modes”. 1. What is the clock source for the timers? Explanation: Timer’s clock source is the crystal that is applied to the controller.
What is the mode 0 of timer in 8051?
The Mode 0 operation is the 8-bit timer or counter with a 5-bit pre-scaler. So it is a 13-bit timer/counter. It uses 5 bits of TL0 or TL1 and all of the 8-bits of TH0 or TH1.
Which mode produces the biggest delay?
Which mode produces the biggest delay in 8051? 16 Bit Timer: This mode is most commonly used for producing the time delay. In this mode all the 16 bits are used for timer and values vary from 0000H to FFFFH.
What are the basic functions of a timer?
What are the basic functions of a timer? Explanation: Timers are used to provide a time delay, they can even act as a counter and control the compare capture mode of a microcontroller.
Which bit of TCON register is used to start or stop timer t0?
The Gatex bit is used to operate the Timerx with respect to the INTx pin or regardless of the INTx pin. GATE1 = 1 ==> Timer1 is operated only if TR1 (in TCON) is SET and Signal on INT1 is HIGH.
TMOD (Timer Mode)
|4 / 0||TxM0||Timer / Counter Operating Mode Select Bit 0|
What is source for timer?
Timer’s clock source is the crystal that is applied to the controller. Timer’s clock source is the crystal that is applied to the controller.
When an interrupt is enabled then where does the pointer moves immediately?
1. When an interrupt is enabled, then where does the pointer moves immediately after this interrupt has occurred? Explanation: When an interrupt occurs, then it jumps to a fixed memory location in memory called the interrupt vector table that holds the address of the Interrupt Service Routine. 2.
Which timer is used as a baud rate generator?
Timer 2 may be used as a baud rate generator. This is accomplished by setting either RCLK (T2CON. 5) or TCLK (T2CON.