Freescale Semiconductor StarCore SC140 - Manual (Page 519)

JF
SC140 DSP Core Reference Manual A-205
JF
Jump If False (AGU)
JF
Description
If the T bit is cleared, program execution continues at a specified 32-bit memory destination address. If the
T bit is set, the PC is updated to point to the next execution set. Program execution continues sequentially.
The destination address cannot be in the middle of an execution set.
Status and Conditions that Affect Instruction
Status and Conditions Changed by Instruction
None.
Example
JF lbl
Operation Assembler Syntax
If T==0, then label
→ PC
JF label {0
≤ label < 2 32
,W}
If T==0, then Rn
→ PC
JF Rn
JF label
Jumps to the absolute memory address specified by a label. The assembler and linker calculate an absolute
address from the label.
JF Rn
Jumps to the memory address specified in an address register (Rn). The value of Rn must be word-aligned.
Register Address Bit Name Description
SR[1] T True bit
Instruction Result
cmpeq.w #$35,d1 Not equal, so T bit in SR cleared.
jf lbl move.w #$29,d1 Jump to lbl, move.w executed.
inc d1 Skipped over.
move.w #$47,d2 Skipped over.
- - - - Skipped over.
- - - - Skipped over.
- - - - Skipped over.
lbl move.w #$1A,d4 Execution continues here at lbl.
Register/Memory Address Before After
SR $00E0 0000