Texas Instruments TMS320C28x Reference Manual page 218

BF 16bitOffset,COND
SYNTAX OPTIONS
BF 16bitOffset,COND
Operands 16bit-
Offset
COND
Description
Flags and V
Modes
Repeat
0101 0110 1100 COND
CCCC CCCC CCCC CCCC
16-bit signed immediate constant offset value (−32768 to +32767 range)
Conditional codes:
COND Syntax
0000 NEQ Not Equal To
0001 EQ Equal To
0010 GT Greater Then
0011 GEQ Greater Then Or Equal To
0100 LT Less Then
0101 LEQ Less Then Or Equal To
0110 HI Higher
0111 HIS, C Higher Or Same, Carry Set
1000 LO, NC Lower, Carry Clear
1001 LOS Lower Or Same
1010 NOV No Overflow
1011 OV Overflow
1100 NTC Test Bit Not Set
1101 TC Test Bit Set
1110 NBIO BIO Input Equal To Zero
1111 UNC Unconditional
Fast conditional branch. If the specified condition is true, then branch by
adding the signed 16-bit constant value to the current PC value; otherwise
continue execution without branching:
If (COND = true) PC = PC + signed 16-bit offset;
If (COND = false) PC = PC + 2;
Note: The branch fast (BF) instruction takes advantage of dual prefetch queue on the
C28x core that reduces the cycles for a taken branch from 7 to 4:
If (COND = true) then the instruction takes 4 cycles.
If (COND = false) then the instruction takes 4 cycles.
If the V flag is tested by the condition, then V is cleared.
This instruction is not repeatable. If this instruction follows the RPT
instruction, it resets the repeat counter (RPTC) and executes only once.
OPCODE OBJMODE
Description
BF 16bitOffset,COND
Branch Fast
RPT CYC
1 − 4/4
Flags Tested
Z = 0
Z = 1
Z = 0 AND N = 0
N = 0
N = 1
Z = 1 OR N = 1
C = 1 AND Z = 0
C = 1
C = 0
C = 0 OR Z = 1
V = 0
V = 1
TC = 0
TC = 1
BIO = 0
−
6-61