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INSTRUCTION SET DESCRIPTIONS
C-46
WAIT Wait:
WAIT
Causes the CPU to enter the wait state
while its test line is not active.
Instruction Operands:
none
None AF –
CF –
DF –
IF –
OF –
PF –
SF –
TF –
ZF –
XCHG Exchange:
XCHG
dest, src
Switches the contents of the source
and destination operands (bytes or
words). When used in conjunction with
the LOCK prefix, XCHG can test and
set a semaphore that controls access
to a resource shared by multiple
processors.
Instruction Operands:
XCHG accum, reg
XCHG mem, reg
XCHG reg, reg
(temp) ← (dest)
(dest) ← (src)
(src) ← (temp)
AF –
CF –
DF –
IF –
OF –
PF –
SF –
TF –
ZF –
Table C-4. Instruction Set (Continued)
Name Description Operation
Flags
Affected
NOTE: The three symbols used in the Flags Affected column are defined as follows:
– the contents of the flag remain unchanged after the instruction is executed
? the contents of the flag is undefined after the instruction is executed
the flag is updated after the instruction is executed