Write a program to count the number of elements in an array

Write a program to count the number of elements in an array whose bits three, lour, and seven are zeroes. The array has 12 elements, each element Is 8-blts, and is stored In memory locations starring from $900. Your code should start from Include an algorithm four flowchart) with your code.

Solution

Mask => 10011000 => $98

Operand at the memory location pointed by 0,x 00100101 => Inv => 11011010
Operand provided by the mask in the instr => 10011000
AND result = 1
Execution will branch to the location specified in the label (yes)

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N equ 12
org $900 ;starting address of the 1st element in the array
array db 1,2,3,4,5,6,7,8,9,10,11,12
total rmb 1 ;variable counting no.of elements with the pattern
org $C000 ;starting address of the program
clr total ;initializing counter to 0
ldx #array ;loading x with the address of the array, X= $900
ldab #N ;B is used as the loop counter
loop brset 0,x,$98,yes
bra chkend
yes inc total ;add 1 to total as the number has the required pattern
chkend inx ;move the array pointer
dbne b,loop
end

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