Ad = As : Aat - Lucent Technologies DSP1617 Information Manual

aD = aS : aaT

(swap accumulator with alternate accumulator)
temp ← (aS); then
(aD) ← (aaT); then
(aaT) ← temp
The contents of alternate accumulator aaT are replaced with the value in aS. The contents of aD are replaced with
the old value in aaT. A temp register is used for the exchange to provide a true swap. All transfers are full 36-bit.
Flags are set based on the value written into aD.
Bit 15 14
Field 1 1
13 12 11 10
1 1 0 D
Words: 1
Cycles: 1
Group: BMU
Addressing: Register
Flags affected: LMI, LEQ, LLV, LMV,
Interruptible: Yes
Cacheable: Yes
Format: 3b
9 8 7 6
S 0 1 1
ODDP, EVENP, MNS1, NMNS1
5 4 3 2
0 1 0 0
1 0
0 T