Sharp PC-1500 Technical Reference Manual page 58

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@
VZR (Vector subroutine jump ii Z Reset)
If Z=O .
it performs the vector subroutine jump, the same as i1b the
VMJ
instruction.
If Z= I, the contro l proceeds
f ()
the succeeding prograrn step.
•Format
VZ R i
@ VVS (Vector subroutine jump if V Set)
If V= I.
ii performs the vector subroutine jum p. the
same
as in
the VM .J
instruction.
If \
1
= 0. the control p r<> Ct.:eds to the succeeding prograrn ste p.
•Format
vvs
i
2-4-10. Return instructions
(By
RTN (ReTurN from subroutine)
The instruction usc:d to return
f ron1
the subroutine to the main r(> utinc.
No change takes place in
flag.~.
·rhc
previous progran1
address is gotten
fro111
€he t xtcrnal
n1cn1or)r stack t< >
he
transfe rred to the program counter.
The next instruction will be fetc hed
from
the
address
indicated
l:>y
the
program
counter.
• Forrnaf
RTN
@ RTI (ReTurn from Interrupt)
•Operation
S + l - · S
(S) - PH
S + l - · S
(S) - Pl.
The inscruction used
10
return
fron1
the interrupt service
routi11e
to the
111ain routi ne.
After executing the san1 e procedure as in the
I~:f!\
instruction. t hen the contents oft he
·r
register a t
the
tinlc of interrupt
are
gotten frorn 1he
external
nlen1ory stack to
be
transferred to the
·· r
register. Flags arc also set to their previous states.
• l: orn1at
RT I
•Operation
S + I - S
(S) - PH
S + i - · S
(S) - Pl.
S + l - · S
(S) - T
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