8 loop la rules, Loop la rules -31, Instructions at the end of long loops -31 – Freescale Semiconductor StarCore SC140 User Manual
Page 281: Lcn write at the end of long loop n -31
Static Programming Rules
SC140 DSP Core Reference Manual
7-31
7.5.8 Loop LA Rules
Rule L.L.1
The following instructions are not allowed at LA-1 or LA of a long loop:
•
COF instructions
•
STOP and WAIT
•
DI
•
DEBUG
Example 7-54. Instructions at the End of Long Loops
move.w #count2,d6
dosetup0 label2
doen0 d6
move.w #1,d1
move.w #2,d2
move.w #3,d3
move.w #4,d4
loopstart0
label2 inc d1
inc d2
inc d3
inc d4
wait
;not allowed
loopend0
Rule L.L.2
A DOENn or MOVE-like instruction that writes a LCn register is not allowed at LA-2, LA-1, or LA of the
same long loop n.
Example 7-55. LCn Write at the End of Long Loop n
doen1 #5
;not allowed
move.w d3,(r1)+
loopend1