26. BRMI – Branch if Minus
26.1. Description
Conditional relative branch. Tests the Negative Flag (N) and branches relatively to PC if N is set. 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 BRBS 2,k.)
Operation:
(i) If N = 1 then PC ← PC + k + 1, else PC ← PC + 1
Syntax: Operands: Program Counter:
(i) BRMI k -64 ≤ k ≤ +63 PC ← PC + k + 1
PC ← PC + 1, if condition is
false
16-bit Opcode:
1111 00kk kkkk k010
26.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
– – – – – – – –
Example:
subi r18,4 ; Subtract 4 from r18
brmi negative ; Branch if result negative
...
negative: 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
53
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