Intel 80C186XL User Manual page 335

INSTRUCTION SET DESCRIPTIONS
Name
DEC Decrement:
DEC dest
Subtracts one from the destination
operand. The operand may be a byte
or a word and is treated as an
unsigned binary number (see AAA and
DAA).
Instruction Operands:
DEC reg
DEC mem
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
ü
the flag is updated after the instruction is executed
C-12
Table C-4. Instruction Set (Continued)
Description Operation
(dest) (dest) – 1
Flags
Affected
ü
AF
CF –
DF –
IF –
ü
OF
ü
PF
ü
SF
TF –
ü
ZF