Computer Hardware User's Guide

RETScond Return From Subroutine Conditionally
13-200
Syntax RETS cond
Operation If cond is true:
*SP– – → PC.
Else, continue.
Operands None
Opcode
31 2423 16 8 7 015
01 1 11 0
0 10
cond 0
0
0
0000000000 000 000
Description A conditional return is performed. If the condition is true, the top of the stack
is popped to the PC.
The ’C3x provides 20 condition codes that you can use with this instruction
(see Table 13–12 on page 13-30 for a list of condition mnemonics, condition
codes, and flags). Condition flags are set on a previous instruction only when
the destination register is one of the extended-precision registers (R7–R0) or
when one of the compare instructions (CMPF, CMPF3, CMPI, CMPI3, TSTB,
or TSTB3) is executed.
Cycles 4
Status Bits LUF Unaffected
LV Unaffected
UF Unaffected
N Unaffected
Z Unaffected
V Unaffected
C Unaffected
OVM Operation is not affected by OVM bit value.Mode Bit