Atmel SAM4SD32B Preliminary Data Sheet page 166

SAM4S Series [Preliminary]
166
The table below shows the ranges for the various branch instructions.
Table 11-26. Branch Ranges
Instruction
B label
(outside IT block)
Bcond label
(inside IT block)
Bcond label
BL{cond} label
BX{cond} Rm
BLX{cond} Rm
The suffix might be used to get the maximum branch range. See
.W
.
Restrictions
The restrictions are:
• do not use PC in the
BLX
• for and , bit[0] of
BX BLX
address created by changing bit[0] to 0
• when any of these instructions is inside an IT block, it must be the last instruction of the IT
block.
is the only conditional instruction that is not required to be inside an IT block. However, it
Bcond
has a longer branch range when it is inside an IT block.
Condition Flags
These instructions do not change the flags.
Examples
B loopA
BLE ng
B.W target
BEQ target
BEQ.W target
BL funC
BX LR
BXNE R0
BLX R0
Branch Range
− 16 MB to +16 MB
− 1 MB to +1 MB
− 16 MB to +16 MB
− 16 MB to +16 MB
Any value in register
Any value in register
instruction
must be 1 for correct execution but a branch occurs to the target
Rm
; Branch to loopA
; Conditionally branch to label ng
; Branch to target within 16MB range
; Conditionally branch to target
; Conditionally branch to target within 1MB
; Branch with link (Call) to function funC, return
; address stored in LR
; Return from function call
; Conditionally branch to address stored in R0
; Branch with link and exchange (Call) to a address
; stored in R0.
"Instruction Width Selection"
11100B–ATARM–31-Jul-12