must be written in assembly code
Write an MSP430 assembly language subroutine, REP_FREE, to examine the elements of an array of positive word-size numbers stored at location ARRAY_IN. The array is already sorted in an ascending order. The first element is the number, n,which is the length of the array. The subroutine will copy the elements from location ARRAY_IN to location ARRAY_OUT. While copying, if an element appears more than once (repeated), then the repeated copies are ignored. In essence, the subroutine eliminates the replicated elements from ARRAY_IN and places the results in ARRAY_OUT. Note that you need to update number m (the first element on the top) which is the actual number of elements in ARRAY_OUT after eliminating all replicates.The subroutine also returns the number of eliminations in R11.
Problem – Determine largest number in an array of n elements. Value of n is stored at address 2050 and array starts from address 2051. Result is stored at address 3050. Starting address of program is taken as 2000.
Example –
Algorithm –
Program –
MEMORY ADDRESS | MNEMONICS | COMMENT |
---|---|---|
2000 | LXI H 2050 | H←20, L←50 |
2003 | MOV C, M | C←M |
2004 | DCR C | C←C-01 |
2005 | INX H | HL←HL+0001 |
2006 | MOV A, M | A←M |
2007 | INX H | HL←HL+0001 |
2008 | CMP M | A-M |
2009 | JNC 200D | If Carry Flag=0, goto 200D |
200C | MOV A, M | A←M |
200D | DCR C | C←C-1 |
200E | JNZ 2007 | If Zero Flag=0, goto 2007 |
2011 | STA 3050 | A→3050 |
2014 | HLT |
Explanation – Registers used: A, H, L, C
must be written in assembly code Write an MSP430 assembly language subroutine, REP_FREE, to examine the...
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