Вот
.equ porta_direct_word =0b11111111
.equ porta_state_word =0b00000000
.equ portc_direct_word =0b11111111
.equ portc_state_word =0b00000000
ldi temporary1,porta_direct_word
out ddra,temporary1
ldi temporary1,porta_state_word
out porta,temporary1
ldi temporary1,portc_direct_word
out ddrc,temporary1
ldi temporary1,portc_state_word
out portc,temporary1
ldi temporary1,(1**sre);+(1**srw11) ;enable XRAM,upper sector
out mcucr,temporary1 ; utilise 3ws srw11:10=1:0
ldi temporary1,(1**srw11) ; lower sector N/A, upper
sts xmcra,temporary1 ;sector mapped $1100-$ffff
sts xmcrb,zero_reg
в указанном секторе вэйтстэйты - 3 такта. **заменяет два "<"(хтмл не разрешает)