Intel 80C188XL - Manual (Page 335)

INSTRUCTION SET DESCRIPTIONS
C-12
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
(dest)
←
(dest) – 1 AF ü
CF –
DF –
IF –
OF
ü
PF ü
SF ü
TF –
ZF
ü
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
ü the flag is updated after the instruction is executed