MOVB AX.MSB, loc16
6-192
MOVB AX.MSB, loc16 Load Byte Value
SYNTAX OPTIONS OPCODE OBJMODE RPT CYC
MOVB AX.MSB, loc16 0011 100A LLLL LLLL X − 1
Operands AX.MS
B
Most significant byte of accumulator high (AH.MSB) or accumulator low
(AL.MSB) register
loc16 Addressing mode (see Chapter 5)
Description Load the most significant byte of the specified AX register (AH.MSB or
AH.LSB) with 8 bits from the location pointed to by the “loc16” addressing
mode. The least significant byte of AX is left unchanged. The form of the
“loc16” operand determines which of its 8 bits are used to load AX.MSB
if(loc16 = *+XARn[offset])
{
if(offset is an even value)
AX.MSB = [loc16.LSB];
if(offset is an odd value)
AX.MSB = [loc16.MSB];
}
else
AX.MSB = [loc16.LSB];
AX.LSB = unchanged;
Note: offset = 3-bit immediate or AR0 or AR1 indexed addressing modes only.
For the following address modes, the returned result is undefined:
*AR6%++ (AMODE = 0)
*0++ (AMODE = x)
*0−− (AMODE = x)
*BR0++ (AMODE = x)
*BR0−− (AMODE = x)
*0++, ARPn (AMODE = 1)
*0−−, ARPn (AMODE = 1)
*BR0++, ARPn (AMODE = 1)
*BR0−−, ARPn (AMODE = 1)
Flags and
Modes
N After the move AX is tested for a negative condition. The negative flag bit is
set if bit 15 of AX is 1; otherwise it is cleared.
Z After the move, AX is tested for a zero condition. The zero flag bit is set if
AX = 0; otherwise it is cleared.
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