Download Microprocessors. Principles and Applications by Michael J. Debenham (Auth.) PDF

By Michael J. Debenham (Auth.)

ISBN-10: 0080242065

ISBN-13: 9780080242064

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A subroutine c a n s t o r e t e m p o r a r y d a t a in t h e s t a c k a s long a s it r e m o v e s it a g a i n , o t h e r w i s e s y n c h r o n i s a t i o n is l o s t . To u s e t h e s t a c k in this manner, auto-increment indirect and indirect auto-decrement addressing a r e needed, rather than their o p p o s i t e s . Program a n d D a t a S t r u c t u r e s If a c o m p l e x s y s t e m is t o work properly it h a s t o be p r o p e r l y p l a n n e d . This m e a n s t h a t t h e r e q u i r e m e n t s should be c a r e f u l l y thought out b e f o r e h a n d , and t h e c o m p o n e n t functions i d e n t i f i e d .

M a c r o -A s sembler s Some a s s e m b l e r s h a v e t h e f a c i l i t y for m a c r o g e n e r a t i o n . A m a c r o i s a group o f i n s t r u c t i o n s defined a n d named by t h e u s e r which may s t o r e d by t h e a s s e m b l e r for i n s e r t i o n in t h e program being a s s e m b l e d w h e n e v e r t h e m a c r o n a m e i s c a l l e d . A m a c r o differs from a subroutine in t h a t t h e s e q u e n c e o f i n s t r u c t i o n s forming t h e m a c r o i s r e p e a t e d in t h e a s s e m b l e d program w h e r e v e r it i s r e q u i r e d .

To c o m p u t e a n a d d r e s s , t h e a d d r e s s field o f t h e i n s t r u c t i o n i s a d d e d t o t h e c o n t e n t s of t h e i n d e x r e g i s t e r by t h e C P U . Input, Output a n d Interrupt 33 'Indirect' a d d r e s s e s a l l o w a named l o c a t i o n t o c o n t a i n , i n s t e a d of d a t a , t h e a d d r e s s of d a t a . T h e r e f o r e , t h e i n s t r u c t i o n r e f e r s t o a word o r words t h a t , in t u r n , r e f e r t o This i s p a r t i c u l a r l y important in g e n e r a l i s e d s o f t w a r e .

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