?? lab5.asm
字號:
**********************************************
* LENGTH-80 LINEAR-PHASE PASSBAND FIR FILTER *
**********************************************
.title "lab5.asm"
.mmregs
.def start
.bss y,1
x_new .usect "DATA1",4
x_old .usect "DATA2",4
size .set 4
PA0 .set 0
PA1 .set 1
.data
COEF .word 0ffdch,0001fh
.word 0ffbah,0ffb4h
.text
start: LD #y,DP
SSBX FRCT
STM #x_new,AR2
STM #x_old+(size-1),AR3
STM #size,BK
STM #-1,AR0
PORTR PA1,*AR2
FIR ADD *AR2+0%,*AR3+0%,A
RPTZ B,#(size-1)
FIRS *AR2+0%,*AR3+0%,COEF
STH B,@y
PORTW @y,PA0
MAR *+AR2(2)%
MAR *AR3+%
MVDD *AR2,*AR3+0%
BD FIR
PORTR PA1,*AR2
.END
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