HP HP-16C - Appendix A: Errors and Flags; Error Conditions

94 Section 9: Program Branching and Controls
Line 015 016 017 018 019
Ry 3 3 3 3 2
T A
z 1
Y 0 1 1
X 1 1 1 1
Keys =% [9](RLC] [x2y] [¢](bsz]
Line 019 decrements the storage register address in R; so the next
loop will sum bits from a new register.
Further Information
Subroutines
Execution. The go to subroutine instruction, label, is a
simple branch with a special trait: it establishes a pending return
condition. Program execution, once transferred to the line
containing the designated label, continues until the first
subsequent instruction is encountered—at which point
execution transfers back to the instruction immediately following
the corresponding instruction.
Subroutine Execution
Program (q] C (g][LBL]1 ’
Start /
/
1 /
\
Execution (9] \ (9](RTN] Y Execution
transfers to returns to
line 000 END RETURN original
and halts. routine.