Sharp CE-150 - Page 293

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@ VZR (Vector subroutine jump ii Z Reset)
If Z=O. it performs the vect or su br out ine jump, the same as i1 b the VMJ instruction.
If Z= I, the c ontr ol proceeds f () the su cceeding pr og rarn step.
•Format
VZ R i
@ VVS (Vector subroutine jump if V Set)
If V= I. ii performs the vec tor subroutine ju mp. the same as in the VM .J instruction.
If \
1
=0. t he c ontrol p r< > Ct.:eds to th e succee di ng pr og rarn st ep.
•Format
vvs i
2-4-10. Return instructions
(By RTN (ReTurN from subroutine)
The instr uc ti on us c:d to return fr on1 th e subroutine to the main r( > ut i nc.
No chan ge ta kes place in fla g.~ .
· rh c prev iou s pr og ran1 address is go tten fro 111 €he txtcrnal n1 c n1 or)r st ack t<> he
trans fe rr ed to t he program co unter.
The next instruction wi ll be fetched fro m th e a ddre ss indicated l:> y the pr og ram co unt er .
• Forrnaf
R TN
@ RTI (ReTurn from Inter rup t)
•Op eration
S + l -· S
(S) - PH
S + l -· S
( S) - Pl.
Th e ins cru ct ion use d 10 re tu rn fron1 t he i nt er ru pt service routi 11e to th e 111 ain routi ne .
Af te r exe cuting the san1e procedure as in the I~ : f !\ ins tru ction. then t he contents oft he
·r register at t he tinlc of interrupt are gotten frorn 1he external nl en1ory stack to be
transferred to th e ·· r re gist er. Fl a gs arc also se t to t he ir previous stat es.
• l:orn1at
RTI
•O pe rati on
S + I - S
(S) - PH
S + i -· S
(S) - Pl.
S + l -· S
(S) - T
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