19. BRGE – Branch if Greater or Equal (Signed)
19.1. Description
Conditional relative branch. Tests the Signed Flag (S) and branches relatively to PC if S is cleared. 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 greater than or equal to 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 BRBC 4,k.)
Operation:
(i) If Rd ≥ Rr (N ⊕ V = 0) then PC ← PC + k + 1, else PC ← PC + 1
Syntax: Operands: Program Counter:
(i) BRGE k -64 ≤ k ≤ +63 PC ← PC + k + 1
PC ← PC + 1, if condition is
false
16-bit Opcode:
1111 01kk kkkk k100
19.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
– – – – – – – –
Example:
cp r11,r12 ; Compare registers r11 and r12
brge greateq ; Branch if r11 ≥ r12 (signed)
...
greateq: 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
46
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