7. ADIW – Add Immediate to Word
7.1. Description
Adds an immediate value (0 - 63) to a register pair and places the result in the register pair. This
instruction operates on the upper four register pairs, and is well suited for operations on the pointer
registers.
This instruction is not available in all devices. Refer to the device specific instruction set summary.
Operation:
(i) Rd+1:Rd ← Rd+1:Rd + K
Syntax: Operands: Program Counter:
(i) ADIW Rd+1:Rd,K d ∈ {24,26,28,30}, 0 ≤ K ≤ 63 PC ← PC + 1
16-bit Opcode:
1001 0110 KKdd KKKK
7.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
– – – ⇔ ⇔ ⇔ ⇔ ⇔
S N ⊕ V, for signed tests.
V Rdh7 • R15
Set if two’s complement overflow resulted from the operation; cleared otherwise.
N R15
Set if MSB of the result is set; cleared otherwise.
Z R15 • R14 • R13 • R12 • R11 • R10 • R9 • R8R7 • R6 • R5 • R4 • R3 • R2 • R1 • R0
Set if the result is $0000; cleared otherwise.
C R15 • Rdh7
Set if there was carry from the MSB of the result; cleared otherwise.
R (Result) equals Rdh:Rdl after the operation (Rdh7-Rdh0 = R15-R8, Rdl7-Rdl0=R7-R0).
Example:
adiw r25:24,1 ; Add 1 to r25:r24
adiw ZH:ZL,63 ; Add 63 to the Z-pointer(r31:r30)
Words 1 (2 bytes)
Atmel AVR Instruction Set Manual [OTHER]
Atmel-0856L-AVR-Instruction-Set-Manual_Other-11/2016
33
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