Freescale Semiconductor StarCore SC140 - Manual (Page 533)

JTD
SC140 DSP Core Reference Manual A-219
JTD
Jump If True Using Delay Slot (AGU)
JTD
Description
If the T bit is set, this instruction continues program execution at a specified 32-bit memory destination
address after executing the execution set in the delay slot. If the T bit is cleared, 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
jtd r0
Operation Assembler Syntax
If T=1, then label
→ PC
JTD label {0
≤ label < 2 32
,W}
If T=1, then Rn
→ PC
JTD Rn
JTD label
Jumps to the memory location specified by the label. The assembler and linker calculate the 32-bit absolute
address from the label.
JTD Rn
Jumps to the memory location contained in an address register (Rn). The value in Rn must be
word-aligned.
Register Address Bit Name Description
SR[1] T True bit
Instruction Comment
move.w #ADRES,r0 Load ADRESS into r0.
move.w #$5,d3 Load 5 into d3.
cmpeq.w#$5,d3 Set the true bit in the status register.
jtd r0 move.w #$45,d0 Jump to ADRESS stored in r0, execute the move.w.
inc d1 Increment executed in the delay slot.
- - - - Skipped over.
- - - - Skipped over.
- - - - Skipped over.
ADRESS Execution continues here at ADRESS.
move.w #$16,d4