Operation:
-(<bit number> of Destination) -->; Z;
Assembler Syntax:
BTST Dn, <ea>
BTST #<data>, <ea>
Attributes: Size = (Byte, Long)
Description: Tests a bit in the destination operand and sets
the Z condition code appropriately. When the destination
is a data register, any of the 32 bits can be specified by
the modulo 32-bit number. When the destination is a
memory location, the operation is a byte operation, and the
bit number is modulo 8. In all cases, bit zero refers to the
least significant bit. The bit number for this operation
may be specified in either of two ways:
1. Immediate -- The bit number is specified in a
second word of the instruction.
2. Register -- The specified data register contains
the bit number.
Condition Codes:
X Not affected.
N Not affected.
Z Set if the bit tested is zero. Cleared otherwise.
V Not affected.
C Not affected.