SUBRL loc32, ACC
6-355
SUBRL loc32, ACC Reverse-Subtract Specified Location From ACC
SYNTAX OPTIONS OPCODE OBJMODE RPT CYC
SUBRL loc32, ACC
0101 0110 0100 1001
0000 0000 LLLL LLLL
1 − 1
Operands loc32 Addressing mode (see Chapter 5)
ACC Accumulator register
Description Subtract from the ACC register the 32-bit location pointed to by the “loc32”
addressing mode and store the result in the location pointed to by “loc32”:
[loc32] = ACC − [loc32];
Flags and
Modes
Z After the subtraction, the Z flag is set if the ACC value is zero, else Z is
cleared.
N After the subtraction, the N flag is set if bit 31 of the ACC is 1, else N is
cleared.
C If the subtraction generates a borrow, C is cleared; otherwise C is set.
V If an overflow occurs, V is set; otherwise V is not affected.
OVC If(OVM = 0, disabled) then if the operation generates a positive overflow,
then the counter is incremented and if the operation generates a negative
overflow, then the counter is decremented. If(OVM = 1, enabled) then the
counter is not affected by the operation.
OVM If overflow mode bit is set; then the ACC value will saturate maximum
positive (0x7FFFFFFF) or maximum negative (0x80000000) if the operation
overflowed.
Repeat This instruction is not repeatable. If this instruction follows the RPT
instruction, it resets the repeat counter (RPTC) and executes only once.
Example
; Calculate the 32-bit value: VarA = VarB − VarA
MOVL ACC,@VarB ; Load ACC with contents of VarB
SUBRL @VarA,ACC ; VarA = ACC − VarA
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