Intel 8XC196NT User Manual page 421

8XC196NT USER'S MANUAL
Mnemonic
CMPB COMPARE BYTES. Subtracts the source
byte operand from the destination byte
operand. The flags are altered, but the
operands remain unaffected. If a borrow
occurs, the carry flag is cleared; otherwise, it
is set.
(DEST) – (SRC)
Z
CMPL COMPARE LONG. Compares the
magnitudes of two double-word (long)
operands. The operands are specified using
the direct addressing mode. The flags are
altered, but the operands remain unaffected.
If a borrow occurs, the carry flag is cleared;
otherwise, it is set.
(DEST) – (SRC)
Z
DEC DECREMENT WORD. Decrements the value
of the operand by one.
←
(DEST)
Z
DECB DECREMENT BYTE. Decrements the value
of the operand by one.
←
(DEST)
Z
A-12
Table A-6. Instruction Set (Continued)
Operation
PSW Flag Settings
N C V VT ST
↑
—
PSW Flag Settings
N C V VT ST
—
(DEST) –1
PSW Flag Settings
N C V VT ST
↑
—
(DEST) –1
PSW Flag Settings
N C V VT ST
↑
—
Instruction Format
DEST, SRC
CMPB breg, baop
(100110aa) (baop) (breg)
DEST, SRC
CMPL Dlreg, Slreg
(11000101) (Slreg) (Dlreg)
DEST
DEC wreg
(00000101) (wreg)
DEST
DECB breg
(00010101) (breg)