Opcode Table:

–INSTR– ZCRI –CON– –DEST– –SRC–	Z Result	C Result	Result	Clocks
010111 0001 1111 --------- ---------	Result = 0	—	Not Written	4

Concise Truth Table:

In					Out
Destination¹	Source	Z	C	Effects	Destination²	Z	C³
$----_----; -	$----_----; -	-	-	wr wz wc	31:9 unchanged, 8:0 = PC+1	0	1

¹ Destination is normally ignored for RET usage, however if the WR effect is given, the RET instruction becomes a CALL instruction and Destination's s-field (lowest 9 bits) are overwritten with the return address (PC+1).
² Destination is not written unless the WR effect is given.
³ The C flag is set (1) unless PC+1 equals 0; very unlikely since it would require the RET to be executed from the top of cog RAM ($1FF; special purpose register VSCL).

Explanation

RET returns execution to a previously recorded address by setting the Program Counter (PC) to that address. The RET instruction is meant to be used along with a label in the form "label_ret" and a CALL instruction that targets RET's routine, denoted by "label." See CALL for more information.

RET is a subset of the JMP instruction but with the i-field set and the s-field unspecified. It is also closely related to the CALL and JMPRET commands; in fact, they are all the same opcode but with different r field and i-field values and varying assembler-driven and user-driven d field and s field values.