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Find out the roll over value for the timer in Mode 0, Mode 1 and Mode 2?

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in Microcontroller by (14.6k points)
Find out the roll over value for the timer in Mode 0, Mode 1 and Mode 2?

(a) 00FFH,0FFFH,FFFFH

(b) 1FFFH,0FFFH,FFFFH

(c) 1FFFH,FFFFH,00FFH

(d) 1FFFH,00FFH,FFFFH

I have been asked this question in exam.

My enquiry is from Timer Programming in portion 8051 Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
Correct option is (c) 1FFFH,FFFFH,00FFH

To elaborate: For Mode 0 13 bit value is used so 1FFFH is chosen to be the roll over value. Similarly for Mode 1 FFFFH and for Mode 2 FFH is the roll over value for the timers and counter.

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