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Load Auxiliary Register
LAR
7-81
Assembly Language Instructions
Description The contents of the specified data-memory address or an 8-bit or 16-bit con-
stant are loaded into the specified auxiliary register (ARx). The specified con-
stant is acted upon like an unsigned integer, regardless of the value of SXM.
The LAR and SAR (store auxiliary register) instructions can be used to load
and store the auxiliary registers during subroutine calls and interrupts. If an
auxiliary register is not being used for indirect addressing, LAR and SAR en-
able the register to be used as an additional storage register, especially for
swapping values between data-memory locations without affecting the con-
tents of the accumulator.
Words
Words Addressing mode
1 Direct, indirect or
short immediate
2 Long immediate
Cycles for a Single LAR Instruction (Using Direct and Indirect Addressing)
Program
Operand ROM DARAM SARAM External
DARAM 2 2 2 2+p
code
SARAM 2 2 2, 3
†
2+p
code
External 2+d
src
2+d
src
2+d
src
3+d
src
+p
code
†
If the operand and the code are in the same SARAM block
Cycles for a Repeat (RPT) Execution of an LAR Instruction (Using Direct
and Indirect Addressing)
Program
Operand ROM DARAM SARAM External
DARAM 2n 2n 2n 2n+p
code
SARAM 2n 2n 2n, 2n+1
†
2n+p
code
External 2n+nd
src
2n+nd
src
2n+nd
src
2n+1+nd
src
p
code
†
If the operand and the code are in the same SARAM block
Cycles for a Single LAR Instruction (Using Short Immediate Addressing)
ROM
DARAM SARAM External
2 2 2 2+p
code
Cycles for a Single LAR Instruction (Using Long Immediate Addressing)
ROM DARAM SARAM External
2 2 2 2+2p
Cycles