Intel Microcontroller, 80C196NU, 8XC196NP manual Compare BYTES. Subtracts the source

8XC196NP, 80C196NU USER’S MANUAL

Table A-6. Instruction Set (Continued)

Mnemonic	Operation		Instruction Format
CMPB	COMPARE BYTES. Subtracts the source		DEST, SRC
	byte operand from the destination byte	CMPB	breg, baop
	operand. The flags are altered, but the
		(100110aa) (baop) (breg)
	operands remain unaffected. If a borrow
	occurs, the carry flag is cleared; otherwise, it
	is set.
	(DEST) – (SRC)

			PSW Flag Settings
		Z	N	C	V	VT	ST
		✓	✓	✓	✓	−	—
CMPL	COMPARE LONG. Compares the								DEST, SRC
	magnitudes of two double-word (long)							CMPL	Dlreg, Slreg
	operands. The operands are specified using
								(11000101) (Slreg) (Dlreg)
	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)
			PSW Flag Settings
		Z	N	C	V	VT	ST
		✓	✓	✓	✓	✓	—
DEC	DECREMENT WORD. Decrements the value								DEST
	of the operand by one.							DEC	wreg
	(DEST) ← (DEST) –1
								(00000101) (wreg)
			PSW Flag Settings
		Z	N	C	V	VT	ST
		✓	✓	✓	✓	−	—
DECB	DECREMENT BYTE. Decrements the value								DEST
	of the operand by one.							DECB	breg
	(DEST) ← (DEST) –1
								(00010101) (breg)
			PSW Flag Settings
		Z	N	C	V	VT	ST
		✓	✓	✓	✓	−	—

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