32. BRVC – Branch if Overflow Cleared
32.1. Description
Conditional relative branch. Tests the Overflow Flag (V) and branches relatively to PC if V is cleared. This
instruction branches relatively to PC in either direction (PC - 63 ≤ destination ≤ PC + 64). Parameter k is
the offset from PC and is represented in two’s complement form. (Equivalent to instruction BRBC 3,k.)
Operation:
(i) If V = 0 then PC ← PC + k + 1, else PC ← PC + 1
Syntax: Operands: Program Counter:
(i) BRVC k -64 ≤ k ≤ +63 PC ← PC + k + 1
PC ← PC + 1, if condition is
false
16-bit Opcode:
1111 01kk kkkk k011
32.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
– – – – – – – –
Example:
add r3,r4 ; Add r4 to r3
brvc noover ; Branch if no overflow
...
noover: nop ; Branch destination (do nothing)
Words 1 (2 bytes)
Cycles 1 if condition is false
2 if condition is true
Atmel AVR Instruction Set Manual [OTHER]
Atmel-0856L-AVR-Instruction-Set-Manual_Other-11/2016
59
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