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Find out the roll over value for the 8051 timer in Mode 0, Mode 1 and Mode 2?a.00FFH,0FFFH,FFFFHb.1FFFH,FFFFH,00FFHc.1FFFH,00FFH,FFFFHd.1FFFH,0FFFH,FFFFH

Question

Find out the roll over value for the 8051 timer in Mode 0, Mode 1 and Mode 2?a.00FFH,0FFFH,FFFFHb.1FFFH,FFFFH,00FFHc.1FFFH,00FFH,FFFFHd.1FFFH,0FFFH,FFFFH

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Solution

The 8051 timer has different roll over values depending on the mode it is in.

  1. Mode 0: In this mode, the timer operates as an 8-bit timer. This means it can count from 00 to FFH. So, the roll over value is 00FFH.

  2. Mode 1: In this mode, the timer operates as a 16-bit timer. This means it can count from 0000 to FFFFH. So, the roll over value is FFFFH.

  3. Mode 2: In this mode, the timer operates as an 8-bit auto-reload timer. This means it can count from 00 to FFH and then it will automatically reload the original value. So, the roll over value is 00FFH.

So, the correct answer is a. 00FFH, FFFFH, 00FFH.

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