Freescale Semiconductor StarCore SC140 - Manual (Page 275)

Static Programming Rules
SC140 DSP Core Reference Manual 7-25
Example 7-43. SR Write to SR Status Bit Use
bmclr #$ffff,sr.h ;change SR
move.w #$1234,d0 ;allowed, not affected by SR
bmclr #$ffff,sr.h ;change SR
rol d0 ;not allowed, affected by SR[C]
bmclr #$ffff,sr.h ;change SR
nop
rol d0
;not allowed, affected by SR[C]
bmclr #$ffff,sr.h ;change SR
nop
nop
rol d0
;allowed
bmclr #<1,sr.l ;change SR
nop
push d0
;not allowed, affected by SR[EXP]
bmclr #<1,sr.h ;change SR
nop
ift clr d0
;not allowed, affected by SR[T]
bmtstc #$0001,sr.l ;read SR, affects SR[T], not a SR write
add d1,d5,d1 ;allowed
pop sr
bmset #$a,sr.l
;allowed
move.l d0,sr
move.l sr,d5
;allowed
bmset #$a,sr.h
and.w #$1234,(sp-8) ;not allowed
bmset #$a,sr.l
and.w #$1234,(sp-8) ;not allowed
bmset #$a,sr.l
bmset #$b,sr.h
;allowed
move.l d1,sr
move.l d0,(sp+4)
;not allowed
move.l d1,sr
move.l d0,(r0+4)
;allowed
move.l d1,sr ;change SR
nop
clr d0
;allowed, clear not effected by SR
move.l d1,sr ;change SR
nop
sub d1,d2,d3
;not allowed, sub effected by S0,S1
move.l d1,sr ;change SR
nop
sub d1,d1,d3
;allowed, this is a CLR