Texas Instruments MSP50C614 manual Conditionals

Conditionals

4.12 Conditionals

The condition bits in the status register (STAT) are used to modify program control through conditional branches and calls. Various combinations of bits are available to provide a rich set of conditional operations. These condition bits can also be used in Boolean operations to set the test flags TF1 and TF2 in the status register.

				'NOT'³	'NOT' ³
			Alternate²		condition
STAT register	Arithmetic/Logic	Condition		condition	alternate²
bit settings	Condition	mnemonic	mnemonic	mnemonic	mnemonic
ZF = 1	Zero flag	ZF		NZF
SF = 1	Sign flag	SF		NSF
CF = 1	Carry flag	CF		NCF
ZF = 0 & CF = 0	Below (unsigned)	B	NAE	NB	AE
ZF = 0 & CF = 1	Above (unsigned)	A	NBE	NA	BE
ZF = 1 & SF = 0	Greater (signed)	G	NLE	NG	LE
ZF = 1 & OF = 0	Equal	E		NE
OF = 1	Overflow flag	OF		NOF
ZF = 0 & SF = 1	Less (signed)	L	NGE	NL	GE
RCF = 1	Rx carry flag	RCF		RNCF
RZF = 0 & RCF = 1	Rx above (unsigned)	RA	RNBE	RNA	RBE
RZF = 1	Rx equal	RE	RZ	RNE	RNZ
TF1 = 1	Test flag 1	TF1		NTF1
TF2 = 1	Test flag 2	TF2		NTF2
TAG = 1	Memory tag	TAG		NTAG
IN1§	Input line 1	IN1		NIN1
IN2§	Input line 2	IN2		NIN2
XZF = 1	Transfer zero flag	XZF		XNZF
XSF = 1	Transfer sign flag	XSF		XNSF
XZF = 0 & XSF = 0	Transfer greater (signed)	XG	XNLE	XNG	XLE

²Alternate mnemonics are provided to help program readability. They generate the same opcodes as the associated condition. ³ Status Register (STAT) bit settings are inverted for NOT conditions.

§ Hardware lines used for I/O expansion design. These lines are PA0 and PA1.

Assembly Language Instructions 4-69