22. BRID – Branch if Global Interrupt is Disabled
22.1. Description
Conditional relative branch. Tests the Global Interrupt Flag (I) and branches relatively to PC if I 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 7,k.)
Operation:
(i) If I = 0 then PC ← PC + k + 1, else PC ← PC + 1
Syntax: Operands: Program Counter:
(i) BRID k -64 ≤ k ≤ +63 PC ← PC + k + 1
PC ← PC + 1, if condition is
false
16-bit Opcode:
1111 01kk kkkk k111
22.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
– – – – – – – –
Example:
brid intdis ; Branch if interrupt disabled
...
intdis: 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
49
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