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Task/Arrays/8051-Assembly/arrays.8051

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+; constant array (elements are unchangeable) - the array is stored in the CODE segment
+myarray db 'Array' ; db = define bytes - initializes 5 bytes with values 41, 72, 72, etc. (the ascii characters A,r,r,a,y)
+myarray2 dw 'A','r','r','a','y' ; dw = define words - initializes 5 words (1 word = 2 bytes) with values 41 00 , 72 00, 72 00, etc.
+; how to read index a of the array
+        push acc
+        push dph
+        push dpl
+        mov dpl,#low(myarray) ; location of array
+        mov dph,#high(myarray)
+        movc a,@a+dptr	; a = element a
+        mov r0, a	; r0 = element a
+        pop dpl
+        pop dph
+        pop acc		; a = original index again
+
+; array stored in internal RAM (A_START is the first register of the array, A_END is the last)
+; initalise array data (with 0's)
+	push 0
+	mov r0, #A_START
+clear:
+	mov @r0, #0
+	inc r0
+	cjne r0, #A_END, clear
+	pop 0
+; how to read index r1 of array
+	push psw
+	mov a, #A_START
+	add a, r1	; a = memory location of element r1
+	push 0
+	mov r0, a
+	mov a, @r0	; a = element r1
+	pop 0
+	pop psw
+; how to write value of acc into index r1 of array
+	push psw
+	push 0
+	push acc
+	mov a, #A_START
+	add a, r1
+	mov r0, a
+	pop acc
+	mov @r0, a	; element r1 = a
+	pop 0
+	pop psw
+
+; array stored in external RAM (A_START is the first memory location of the array, LEN is the length)
+; initalise array data (with 0's)
+	push dph
+	push dpl
+	push acc
+	push 0
+	mov dptr, #A_START
+	clr a
+	mov r0, #LEN
+clear:
+	movx @dptr, a
+	inc dptr
+	djnz r0, clear
+	pop 0
+	pop acc
+	pop dpl
+	pop dph
+; how to read index r1 of array
+	push dph
+	push dpl
+	push 0
+	mov dptr, #A_START-1
+	mov r0, r1
+	inc r0
+loop:
+	inc dptr
+	djnz r0, loop
+	movx a, @dptr	; a = element r1
+	pop 0
+	pop dpl
+	pop dph
+; how to write value of acc into index r1 of array
+	push dph
+	push dpl
+	push 0
+	mov dptr, #A_START-1
+	mov r0, r1
+	inc r0
+loop:
+	inc dptr
+	djnz r0, loop
+	movx @dptr, a	; element r1 = a
+	pop 0
+	pop dpl
+	pop dph