MAXQ7665/MAXQ7666 User’s Guide
14-21
RET Return from Subroutine
Description: RET pops a single word from the stack (@SP) into the Instruction Pointer (IP) and decrements the stack pointer (SP).
The decremented SP is saved as the new stack pointer (SP).
Status Flags: None
Operation: IP ← @ SP--
Encoding: 15 0
Example(s): RET
Code Execution:
Stack Data:
← SP (before RET)
← SP (after RET)
RET C/RET NC Conditional Return on Status Flag
RET Z/RET NZ
RET S
Description: Performs conditional return (RET) based upon the state of a specific processor status flag. RET C returns if the Carry
flag is set while RET NC returns if the Carry flag is clear. RET Z returns if the Zero flag is set while RET NZ returns if
the Zero flag is clear. RET S returns if the Sign flag is set. See RET for additional information on the return operation.
Status Flags: None
RET C C=1: IP ← @SP--
Operation: C=0: IP ← IP + 1
Encoding: 15 0
Example(s): RET C ; C=1, return (RET) is performed
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