Sharp PC-1500 - Page 56

All and more about Sharp PC-1500 at http:/lwww.PC-1500.info
@ VMJ (Vector 2 byt e Subrouti ne Jump )
Jumps to the addrc~ s indicated by the two -byte vector addrc~ s . whose high order
address byte is represented by FFH and low order address byte by the immediate data.
TI1e nag Z is reset.
Vector
add ress table contains FF OO H thru FFF6 H. lrnmcclia1c value i may take even
nu rnb~r of OOH 1hru F6 H.
•F ormat
YM .J i
•O peration
PL - (S)
(E X)
S - I - S
PH - (S)
S - I - S
(FFOOH+i) - PH
(FF OOH + i+I) - Pl.
YMJ CO H
• lX>H
""' "
Th e conten1s of FFCOH are in terrogated
"'''"
by the VMJ instrucuon and j ump to the
subrout ine of EOCOH .
With the RTN instructi on ol the
subrou1ine. the execution resumes from
the address 4002H again
Because
11 pcrrni1s subroutine jump by
two byte s of instruc1ion. 11 helps to
·-
reduce program steps, as com pared with
the
SJP instruction.
,.,
} 'tMJ ~ lfll( ! (ll'>
"""
i.-...
~
s..-. ....
pr O( • U l"C
·--;;:---
~ -
.. - ~
H (I H CO..
Do not sell this PDF !!!
51