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Individual Instruction Descriptions
4-151
Assembly Language Instructions
4.14.56 RET Return From Subroutine (CALL, C
cc
)
Syntax
[label] name
Clock,
clk
Word,
w
With RPT,
clk
Class
RET 1 1 N/R 5
Execution PC ⇐ TOS
R7 ⇐ R7 – 2
TOS ⇐ *R7
Flags Affected None
Opcode
Instructions 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RET 1 1 0 1 1 1 1 0 0 0 1 1 1 1 1 1 0
Description Return from call or vectored call. Pop stack to program counter, continue
execution. Returns from subroutine calls (CALL, C
cc
instructions) and
interrupts are different because of the way each process is handled. In order
to prevent execution pipeline problems the interrupt return (IRET) instruction
uses two cycles and the Return (RET) instruction cannot immediately follow
a CALL, i.e., RET followed by a RET should not be allowed.
See Also CALL, C
cc
, IRET
Example 4.14.56.1 RET
Returns from subroutine. A CALL or C
cc
instruction must have executed before.