30. BRTC – Branch if the T Flag is Cleared
30.1. Description
Conditional relative branch. Tests the T Flag and branches relatively to PC if T 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 6,k.)
Operation:
(i) If T = 0 then PC ← PC + k + 1, else PC ← PC + 1
Syntax: Operands: Program Counter:
(i) BRTC k -64 ≤ k ≤ +63 PC ← PC + k + 1
PC ← PC + 1, if condition is
false
16-bit Opcode:
1111 01kk kkkk k110
30.2. Status Register (SREG) and Boolean Formula
I T H S V N Z C
– – – – – – – –
Example:
bst r3,5 ; Store bit 5 of r3 in T Flag
brtc tclear ; Branch if this bit was cleared
...
tclear: 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
57
To Next Page
Loading...
Need help?
General
