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In the instruction “MOV TH1,#-3”, what is the value that is being loaded in the TH1 register?

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In the instruction “MOV TH1,#-3”, what is the value that is being loaded in the TH1 register?

(a) 0xFCH

(b) 0xFBH

(c) 0xFDH

(d) 0xFEH

The question was asked in unit test.

This key question is from Timer Programming in chapter 8051 Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
Correct answer is (c) 0xFDH

To explain: Negative value is loaded in 2’s complement form. -3 represented in 2’s complement form as FDH.

Steps to convert into 2’s complement:

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