67. LAC – Load and Clear
67.1. Description
Load one byte indirect from data space to register and stores and clear the bits in data space specified by
the register. The instruction can only be used towards internal SRAM.
The data location is pointed to by the Z (16 bits) Pointer Register in the Register File. Memory access is
limited to the current data segment of 64KB. To access another data segment in devices with more than
64KB data space, the RAMPZ in register in the I/O area has to be changed.
The Z-pointer Register is left unchanged by the operation. This instruction is especially suited for clearing
status bits stored in SRAM.
Operation:
(i) (Z) ← ($FF – Rd) • (Z), Rd ← (Z)
Syntax: Operands: Program Counter:
(i) LAC Z,Rd 0 ≤ d ≤ 31 PC ← PC + 1
16-bit Opcode:
1001 001r rrrr 0110
67.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
– – – – – – – –
Words 1 (2 bytes)
Cycles 2
Atmel AVR Instruction Set Manual [OTHER]
Atmel-0856L-AVR-Instruction-Set-Manual_Other-11/2016
104
To Next Page
Loading...
Need help?
General
