Timers 8051

Write the number and size of timers in 8051 microcontrollers

• Two with 8 bit 

• Two with 16 bit 

• One with 20 bit 

• One with 32 bit 

1.      ---------------used to count external events .

• Timers

• Counters

• Mode register

• Control register

1.      8051 microcontrollers counters are -----------------

• Down counters

• UP counters

• Serial Counters

• parallel Counters

    The control word of TMOD register is  03H .  Identify the timer and mode

• Timer 0 Mode 3

• Timer 0 Mode 0

• Timer 1 Mode 3

• Timer 1 Mode 0

1.      Which bit will set during roll over condition ?

• IT

• IR

• TR

• TF

Determine the clock frequency, if the crystal frequency is 12MHz

• 1.085 Mega Hz

• 1 Mega Hz

• 2 Mega Hz

• 3 Mega Hz

Identify the control register related to Timers

• TMOD

• SCON

• PCON

• TCON

Identify the non bit addressable register in Timers

• TCON

• PCON

• SCON

• TMOD

8     In TMOD register if C/T = 0, it acts as a -------

• Counter

• Timer

• UP counter

• Down counter

Which mode of Timer is called as auto reload mode?

• Timer 0

• Timer 1

• Timer 2

• Timer 3