Texas Instruments TMS320C28x Reference Manual page 277

LB 22bit
LB 22bit
SYNTAX OPTIONS
LB 22bit
Operands 22bit
Description
Flags and
Modes
Repeat
Example
; Branch to subroutines in SwitchTable selected by Switch
; value:
SwitchTable:
.long
.long
MOVL
Table
MOVZ
MOVL
LB
SwitchReturn:
Switch0:
LB
Switch1:
LB
6-120
22-bit program-address (0x000000 to 0x3FFFFF range)
Long branch. Load the PC with the selected 22-bit program address:
PC = 22bit;
None
This instruction is not repeatable. If this instruction follows the RPT
instruction, it resets the repeat counter (RPTC) and executes only once.
Switch0
Switch1
.
.
XAR2,#Switch-
AR0,@Switch
XAR7,*+XAR2[AR0] ; XAR7 = SwitchTable[Switch]
*XAR7
.
.
.
.
SwitchReturn
.
.
SwitchReturn
OPCODE
0000 0000 01CC CCCC
CCCC CCCC CCCC CCCC
; Switch address table:
; Switch0 address
; Switch1 address
; XAR2 = pointer to SwitchTable
; AR0 = Switch index
; Indirect branch using XAR7
; Function A:
; Return: long branch
; Function B:
; Return: long branch
Long Branch
OBJMODE RPT CYC
X − 4