86. OR – Logical OR
86.1. Description
Performs the logical OR between the contents of register Rd and register Rr, and places the result in the
destination register Rd.
Operation:
(i) Rd ← Rd v Rr
Syntax: Operands: Program Counter:
(i) OR Rd,Rr 0 ≤ d ≤ 31, 0 ≤ r ≤ 31 PC ← PC + 1
16-bit Opcode:
0010 10rd dddd rrrr
86.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
– – – ⇔ 0 ⇔ ⇔ –
S N ⊕ V, for signed tests.
V 0
Cleared.
N R7
Set if MSB of the result is set; cleared otherwise.
Z R7 • R6 • R5 • R4 • R3 • R2 • R1 • R0
Set if the result is $00; cleared otherwise.
R (Result) equals Rd after the operation.
Example:
or r15,r16 ; Do bitwise or between registers
bst r15,6 ; Store bit 6 of r15 in T Flag
brts ok ; Branch if T Flag set
...
ok: nop ; Branch destination (do nothing)
Words 1 (2 bytes)
Cycles 1
Atmel AVR Instruction Set Manual [OTHER]
Atmel-0856L-AVR-Instruction-Set-Manual_Other-11/2016
132
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