52. CPSE – Compare Skip if Equal
52.1. Description
This instruction performs a compare between two registers Rd and Rr, and skips the next instruction if Rd
= Rr.
Operation:
(i) If Rd = Rr then PC ← PC + 2 (or 3) else PC ← PC + 1
Syntax: Operands: Program Counter:
(i) CPSE Rd,Rr 0 ≤ d ≤ 31, 0 ≤ r ≤ 31 PC ← PC + 1, Condition false -
no skip
PC ← PC + 2, Skip a one word
instruction
PC ← PC + 3, Skip a two word
instruction
16-bit Opcode:
0001 00rd dddd rrrr
52.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
– – – – – – – –
Example:
inc r4 ; Increase r4
cpse r4,r0 ; Compare r4 to r0
neg r4 ; Only executed if r4<>r0
nop ; Continue (do nothing)
Words 1 (2 bytes)
Cycles 1 if condition is false (no skip)
2 if condition is true (skip is executed) and the instruction skipped is 1 word
3 if condition is true (skip is executed) and the instruction skipped is 2 words
Atmel AVR Instruction Set Manual [OTHER]
Atmel-0856L-AVR-Instruction-Set-Manual_Other-11/2016
83
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