Atmel SAM4S Xplained Pro Starter and Evaluation Kit ATSAM4S-XPRO ATSAM4S-XPRO Ficha De Dados
Códigos do produto
ATSAM4S-XPRO
SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
182
12.6.10.2CBZ and CBNZ
Compare and Branch on Zero, Compare and Branch on Non-Zero.
Syntax
Syntax
CBZ Rn, label
CBNZ Rn, label
where:
Rnis the register holding the operand.
labelis the branch destination.
Operation
Use the CBZ or CBNZ instructions to avoid changing the condition code flags and to reduce the number of
Rnis the register holding the operand.
labelis the branch destination.
Operation
Use the CBZ or CBNZ instructions to avoid changing the condition code flags and to reduce the number of
instructions.
CBZ Rn, label does not change condition flags but is otherwise equivalent to:
CBZ Rn, label does not change condition flags but is otherwise equivalent to:
CMP
Rn, #0
BEQ
label
CBNZ Rn, label does not change condition flags but is otherwise equivalent to:
CMP
Rn, #0
BNE
label
Restrictions
The restrictions are:
The restrictions are:
Rn
must be in the range of R0 to R7
The branch destination must be within 4 to 130 bytes after the instruction
These instructions must not be used inside an IT block.
Condition Flags
These instructions do not change the flags.
Examples
These instructions do not change the flags.
Examples
CBZ
R5, target
; Forward branch if R5 is zero
CBNZ
R0, target ; Forward branch if R0 is not zero