tut-ch2-ch3-Solutions.pdf - 300044 Microcontrollers PLCs(Microcontrollers Solutions to Tutorial Questions \u2013 week 10 Review Problems \u2013 Chapter 2 7

# tut-ch2-ch3-Solutions.pdf - 300044 Microcontrollers...

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1 300044 Microcontrollers & PLCs (Microcontrollers) Solutions to Tutorial Questions – week 10 Review Problems – Chapter 2 7. What is the address of the file register to be modified by theaddwf 0x230, finstruction? Solution: The file register with the address 0x230 is modified. 9. Given a 16 MHz clock, how long do the three instructions starting from location 0x020e(addwf, movwf, goto)of List 2-2 take to execute? Give the answer in us (microseconds). Solution: The addwf andmovwfinstructions require 1 instruction cycle, and the gotoinstruction requires 2 instruction cycles. The duration of 1 instruction cycle is equal to 4/16M=0.25 us. Thus the first two instructions require 0.25us each to complete and the last one 0.5us, and the total time is 1 us. 11. Write an instruction sequence that copies the contents of locations0x120through0x123to locations0x220through0x223, in data memory.Solution: 120H=0001 0010 0000 = 00010 - 010 0000 is in bank 2, and 220H=0010 0010 0000 is in bank 4. Then the data transfer can be accomplished by the following instructions: movlb 2 movf 0x120, w movlb 4 movwf 0x220 movlb 2 movf 0x121, w

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