Texas Instruments TMS320C28x, Reference Manual

Page: 377 / 695

MOVU ACC,loc16
6-220
MOVU ACC,loc16 Load Accumulator With Unsigned Word
SYNTAX OPTIONS OPCODE OBJMODE RPT CYC
MOVU ACC,loc16
0000 1110 LLLL LLLL
X − 1
Operands ACC Accumulator register
loc16 Addressing mode (see Chapter 5)
Description Load the low half of the accumulator (AL) with the 16-bit contents of the
addressed location pointed to by the “loc16” addressing mode and fill the
high half of the accumulator (AH) with 0s:
AL = [loc16];
AH = 0x0000;
Flags and
Modes
N Clear flag.
Z After the load, the Z flag is set if the ACC value is zero, else Z is cleared.
Repeat
This instruction is not repeatable. If this instruction follows the RPT
instruction, it resets the repeat counter (RPTC) and executes only once.
Example
; Add three 32-bit unsigned variables by 16-bit parts:
MOVU ACC,@VarAlow ; AH = 0, AL = VarAlow
ADD ACC,@VarAhigh << 16 ; AH = VarAhigh, AL = VarAlow
ADDU ACC,@VarBlow ; ACC = ACC + 0:VarBlow
ADD ACC,@VarBhigh << 16 ; ACC = ACC + VarBhigh << 16
ADDCU ACC,@VarClow ; ACC = ACC + V Carry
ADD ACC,@VarChigh << 16 ; ACC = ACC + VarChigh << 16