Spectravideo SVI 318 Service – Technical Manual page 40

Ins t ruct ion Set
T he Z80 m i c rop roce s s or h a s o ne o f t he mo s t pow e r f u l and ve r s a t i l e
in s t r uc t i on se t s �va i l a b l e in any 8-b i t m i c r o p roce s s o r .
un i que ope r a t i o n s
w i t h i n memo ry or be tween memo ry a n d 1 / 0 .
b i t in any l oc a t i on in memory .
The ins t r u c t i o n s a re d i v i de d i n t o t he fo l low ing c a tegor i e s :
C
8 -b i t l oa d s
[J
1 6 -b i t l o a d s
[]
E xchange s , b l ock t r a ns f e r s , a n d s e a r c he s
[]
8-b i t a r i t hme t i c and l o g ic ope r a t i ons
[:
Gene ra l - pu rpose a r i t hme t i c and CPU con t r o l
[:
1 6 -b i t a r i t hme t i c op e r a t i on s
[J
Rot a t e s and sh i f t s
c=
B i t se t , re s e t , and t e s t ope r a t ions
C
J ump s
[J
Ca l l s , re t u rn s , and re s t a r t s
[]
Input a n d o u t p u t op e r a t i o n s
A va r i e t y o f a dd re s s ing modes are imp l eme n t e d t o pe rm i t e f f i c i e n t and f a s t
d a t a t ra n s f e r b e tween v a r i ous reg i s te r s , memory l oca t i ons , and i npu t / ou tput
d ev i ce s . The s e a ddre s s i ng mod e s inc l ud e :
[]
lnme di a t e
[]
lnme dia t e e x t ended
c
Mod i f i e d
page
c
Re l a t i ve
c
.-- E xt e nd e d
I
L..;.
Indexed
c
Reg i s t e r
�
r
Reg i s t e r ind i re c t
c
lmp l ie d
as
a b l ock move for f a s t , e f f i c i ent d a ta t r ans f e r s
zero
4 . 7
I t inc l u d e s such
I t a l s o a l l ows ope r a t i on s o n any