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при 8мгц - 4.5мкс, при 16 - 2.25 проверь
.include "m8def.inc".equ diff_coeff =-9999
.equ Y_old_state =$100
.equ X_current =$102
.equ X_old =$104
ldi r23,high(diff_coeff)
ldi r22,low(diff_coeff)lds r20,Y_old_state
lds r21,Y_old_state+1
muls r23, r21
movw r19:r18, r1:r0
mul r22, r20
movw r17:r16, r1:r0
mulsu r23, r20
sbc r19, r2
add r17, r0
adc r18, r1
adc r19, r2
mulsu r21, r22
sbc r19, r2
add r17, r0
adc r18, r1
adc r19, r2 ;r18:r19 contain y(n-1)*b (signed)lds r8,X_current
lds r9,X_current+1
sub r8,r18
sbc r9,r19 ;r8:r9 contain x(n)-y(n-1)*blds r18,X_old
lds r19,X_old+1
sub r8,r18
sbc r9,r19 ;r8:r9 contain x(n)-y(n-1)*b-x(n-1)
может надо было флоат? или 24р? Если учесть что кое что может быть в регистрах, то быстрее
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