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Power Programmierung
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Power-Programmierung (Tewi)(1994).iso
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assemblr
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library
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zenlib
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lst7_12.asm
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Assembly Source File
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1990-02-15
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766b
|
31 lines
;
; *** Listing 7-12 ***
;
; Adds up the elements of a byte-sized array using
; base-only addressing inside the loop, and using
; an immediate operand with ADC.
;
jmp Skip
;
ARRAY_LENGTH equ 1000
TestArray db ARRAY_LENGTH dup (1)
TEST_START_OFFSET equ 200 ;we'll add elements 200-299
TEST_LENGTH equ 100 ; of TestArray
;
Skip:
call ZTimerOn
mov bx,offset TestArray+TEST_START_OFFSET
;build the array start
; offset right into the
; base so we can use
; base+index addressing,
; with no displacement
sub ax,ax ;initialize sum
mov cx,TEST_LENGTH ;# of bytes to add
SumArrayLoop:
add al,[bx] ;add in the next byte
adc ah,0 ; to the 16-bit sum
inc bx ;point to next byte
loop SumArrayLoop
call ZTimerOff