What is Timer In PIC18?

• Used to count clock signal coming in to it.

• used to count object.

• a type of watch.

• used as pin direction

Answer explanation

✓TIMER IN THE PIC18F REFER TO THE HARDWARE TIMER INSIDE THE PIC18F ITSELF.

✓IT IS USED TO COUNT CLOCK SIGNAL COMING IN TO IT.

Which is FOUR(4) types of timers?

• TIMER1 TIMER2 TIMER3 TIMER4

• TIMER0 TIMER1 TIMER2 TIMER3

• TIMER A0 TIMER A1 TIMER A2 TIMER A3

• TIMER A TIMER B TIMER C TIMER D

Which timer that can be used to as both 8-bit mode and 16-bit mode?

• TIMER 3

• TIMER 2

• TIMER 1

• TIMER 0

Answer explanation

In the PIC18F4550, only Timer0 that can be used as 8-bit or 16-bit timer. Therefore, we are only discuss on this timer.

What is pre-scaler?

• A prescaler is an electronic counting circuit used to reduce a high pin electrical signal to a lower pin.

• A prescaler is an electronic counting circuit used to determine electrical signal direction.

• A prescaler is an electronic counting circuit used to reduce a high frequency electrical signal to a lower frequency by integer division.

• A prescaler is an electronic counting circuit used to generate a high pin electrical signal to a lower pin.

Which table register to be used to configure Timer 0 register.

• ADCON0 register table.

• T0CON register table.

• CCPON register table

• CCPRIL register table.

What is the instruction to start the timer in programming for Timer 0?

• GoDone Timer0=1

• Go timer =1

• Start Timer =1

• TMR0CON=1

What is the instruction to stop timer in Timer 0?

• Stop Timer0=0

• TMR0ON=0

• DisableTimer0=0

• Undo Timer0=0

What is the instruction to clear the timer flag for the next round for Timer0?

• TMR0IF=1

• TMR0IF=0

• ClearFlag0=0

• FlagStop0=0

By referring the T0CON table, find the value for T0CON if we want to program TIMER0 in 16-bit mode, no prescaler. Use PIC18’s fosc/4 crystal for the clock source, increment on positive-edge.

• TOCON=0b10101010

• TOCON=0b11110111

• TOCON=0b00001000

• TOCON=0b01010101

By referring the T0CON table, find the value for T0CON if we want to program TIMER0 in 8-bit mode, no prescaler. Use PIC18’s Fosc/4 crystal for the clock source, increment on negative-edge.

• T0CON=0b01011000

• T0CON=0b11001100

• T0CON=0b01011110

• T0CON=0b00011010