Texas Instruments TMS320C3x - Manual (Page 656)

RETIcond Return From Interrupt Conditionally
13-198
Syntax RETI cond
Operation If cond is true:
*SP – –
→
PC
1
→
ST (GIE).
Else, continue.
Operands None
Opcode
31 24 23 16 8 7 0 15
0 1 1 1 1 0 0 0 0 cond 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Description A conditional return is performed. If the condition is true, the top of the stack
is popped to the PC, and a 1 is written to the global interrupt enable (GIE) bit
of the status register. This has the effect of enabling all interrupts for which the
corresponding interrupt enable bit is a 1.
The ’C3x provides 20 condition codes that can be used 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