Sharp CE-150 - Page 290

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@ VEJ (VEctor subroutine J ump)
On e step subroulinc j1ut1p inst ru ction that jun 1p s to the addre ss indicated by the t\VO -
bytc vcct0r. who se high order add ress byte is represented by FFH a ncl low order
add ress byte by the opera nd or the ins truc ti on .
The nag Z is re set.
Th ere arc 28 kinds or VE .I opera rtd wit hin two bytes range of 11000000 (COH) to
1 11 10 1 IO (F6H). T herefore. the ve ctor addre ss table conta ins the a ddre ss area or
FFCOH to FFF6H .
•F orm at
VE.I i
• Operalion
PL. - (S)
S - 1- S
PH - (S)
S - 1- S
( FFOOH+ i) - · PH
(FFOOH+ i+ I) - PL
NO TE: i ha s 28 ki nds of VEJ operands.
( EX) VEJ C4H
TM co nt ents of FFC4H and FFCSH are
'i « - t-Of
interrogated at the address 4000H and
Sutl r Ou tn lf
IU!I\()
ju mp to t he subr -Outine of 4500H.
\\li th the RTN i nst ruction of the
subroutine. the e .x ec ut ion resumes from
lh e address 4001H again.
Because it permits subroutine jump by a
s in g le byte of instruct io n. it t 1e l ps to
r educe program steps. '. vhen app lied to
1 00 often appear in g subro ul ine.
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