25. BRLT – Branch if Less Than (Signed)
25.1. Description
Conditional relative branch. Tests the Signed Flag (S) and branches relatively to PC if S is set. If the
instruction is executed immediately after any of the instructions CP, CPI, SUB, or SUBI, the branch will
occur if and only if, the signed binary number represented in Rd was less than the signed binary number
represented in Rr. 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 4,k.)
Operation:
(i) If Rd < Rr (N ⊕ V = 1) then PC ← PC + k + 1, else PC ← PC + 1
Syntax: Operands: Program Counter:
(i) BRLT k -64 ≤ k ≤ +63 PC ← PC + k + 1
PC ← PC + 1, if condition is
false
16-bit Opcode:
1111 00kk kkkk k100
25.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
– – – – – – – –
Example:
cp r16,r1 ; Compare r16 to r1
brlt less ; Branch if r16 < r1 (signed)
...
less: 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
52
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