Motorola 24-Bit Digital Signal Processor manual Transfer Conditionally, Cc’’ Mnemonic Condition

INSTRUCTION DESCRIPTIONS

	Tcc	Transfer Conditionally		Tcc
Operation:			Assembler Syntax:
	If cc, then S1 ➞ D1		Tcc S1,D1
	If cc, then S1 ➞ D1 and S2 ➞ D2		Tcc S1,D1 S2,D2

Description: Transfer data from the specified source register S1 to the specified desti- nation accumulator D1 if the specified condition is true. If a second source register S2 and a second destination register D2 are also specified, transfer data from address reg-

ister S2 to address register D2 if the specified condition is true. If the specified condition is false, a NOP is executed. The term “cc’’ may specify the following conditions:

	“cc’’ Mnemonic	Condition
CC (HS)	— carry clear (higher or same)	C=0
CS (LO)	— carry set (lower)	C=1
EC	— extension clear	E=0
EQ	— equal	Z=1
ES	— extension set	E=1
GE	— greater than or equal	N ⊕ V=0
GT	— greater than	Z+(N	⊕ V)=0
LC	— limit clear	L=0	⊕ V)=1
LE	— less than or equal	Z+(N
LS	— limit set	L=1
LT	— less than	N ⊕ V=1
MI	— minus	N=1
NE	— not equal	Z=0	•
NR	— normalized	Z+(U		E)=1
PL	— plus	N=0	•
NN	— not normalized	Z+(U
				E)=0

where

U denotes the logical complement of U, + denotes the logical OR operator,

• denotes the logical AND operator, and

⊕ denotes the logical Exclusive OR operator

When used after the CMP or CMPM instructions, the Tcc instruction can perform many

useful functions such as a “maximum value,” “minimum value,” “maximum absolute

value,” or “minimum absolute value” function. The desired value is stored in the destina-

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