Texas Instruments TMS320C3x - Manual (Page 565)

Interrupt Acknowledge IACK
13-107 Assembly Language Instructions
Syntax IACK src
Operation Perform a dummy read operation with IACK = 0.
At end of dummy read, set IACK to 1.
Operands src general addressing modes (G):
0 1 direct
1 0 indirect
Opcode
31 24 23 16 8 7 0 15
0 0 0 1 1 1 src 1 G 0 0 0 0 0 0 0
Description A dummy read operation is performed if off-chip memory is specified. IACK is
set to 0, regardless of
src location, a half H1 cycle after the beginning of the
decode phase of the IACK instruction. At the first half of the H1 cycle of the
completion of the dummy read, IACK is set to 1. The IACK signal will not be
extended due to multicycle reads with wait states. This instruction can be used
to generate an external interrupt acknowledge. The IACK signal and the ad-
dress can be used to signal interrupt acknowledge to external devices. The
data read by the processor is unused.
Cycles 1
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