Микроконтроллеры

        ;18*8+14*8+12=268 cy(13,4uS) 32bit wide
        ;3,26uS (65 cycles) free



.def    temporary_l             =r0
.def    temporary_h             =r1
.def    current_port_l          =r26
.def    current_port_h          =r27
.def    old_port_l              =r28
.def    old_port_h              =r29
.def    minus_1_container       =r30
.def    _3_byte_counter         =r31

.def    _4_byte_ch_0_counter    =r16
.def    _4_byte_ch_1_counter    =r17
.def    _4_byte_ch_2_counter    =r2
.def    _4_byte_ch_3_counter    =r3
.def    _4_byte_ch_4_counter    =r4
.def    _4_byte_ch_5_counter    =r5
.def    _4_byte_ch_6_counter    =r6
.def    _4_byte_ch_7_counter    =r7
.def    _4_byte_ch_8_counter    =r8
.def    _4_byte_ch_9_counter    =r9
.def    _4_byte_ch_10_counter   =r10
.def    _4_byte_ch_11_counter   =r11
.def    _4_byte_ch_12_counter   =r12
.def    _4_byte_ch_13_counter   =r13
.def    _4_byte_ch_14_counter   =r14
.def    _4_byte_ch_15_counter   =r15

.def    _3_byte_ch_8_counter    =r18
.def    _3_byte_ch_9_counter    =r19
.def    _3_byte_ch_10_counter   =r20
.def    _3_byte_ch_11_counter   =r21
.def    _3_byte_ch_12_counter   =r22
.def    _3_byte_ch_13_counter   =r23
.def    _3_byte_ch_14_counter   =r24
.def    _3_byte_ch_15_counter   =r25


.dseg
channel_0_counter:      .byte   3
channel_1_counter:      .byte   3
channel_2_counter:      .byte   3
channel_3_counter:      .byte   3
channel_4_counter:      .byte   3
channel_5_counter:      .byte   3
channel_6_counter:      .byte   3
channel_7_counter:      .byte   3

channel_8_counter:      .byte   2
channel_9_counter:      .byte   2
channel_10_counter:     .byte   2
channel_11_counter:     .byte   2
channel_12_counter:     .byte   2
channel_13_counter:     .byte   2
channel_14_counter:     .byte   2
channel_15_counter:     .byte   2


.cseg
        rjmp    startup


startup:


        ;....



main_cy:
        ldi     minus_1_container,low(-1)               ;1

        in      current_port_l,pinc                     ;1
        in      current_port_h,pinb                     ;1

        movw    temporary_l,current_port_l              ;1

        eor     temporary_l,old_port_l                  ;1
        eor     temporary_h,old_port_h                  ;1

        movw    old_port_l,current_port_l               ;1

        and     temporary_l,current_port_l              ;1
        and     temporary_h,current_port_h              ;1


        sbrs    temporary_l,0                           ;2
        rjmp    other_L_channel_analyse

        lds     current_port_l,channel_0_counter        ;2
        lds     current_port_h,channel_0_counter+1      ;2
        lds     _3_byte_counter,channel_0_counter+2     ;2

        sub     current_port_l,minus_1_container        ;1
        sbc     current_port_h,minus_1_container        ;1
        sbc     _3_byte_counter,minus_1_container       ;1
        sbc     _4_byte_ch_0_counter,minus_1_container  ;1

        sts     channel_0_counter,current_port_l        ;2
        sts     channel_0_counter+1,current_port_h      ;2
        sts     channel_0_counter+2,_3_byte_counter     ;2
                                                        ;*8
other_L_channel_analyse:

        ;...

        sbrs    temporary_h,0                           ;2
        rjmp    other_H_channel_analyse

        lds     current_port_l,channel_8_counter        ;2
        lds     current_port_h,channel_8_counter+1      ;2

        sub     current_port_l,minus_1_container        ;1
        sbc     current_port_h,minus_1_container        ;1
        sbc     _3_byte_ch_8_counter,minus_1_container  ;1
        sbc     _4_byte_ch_8_counter,minus_1_container  ;1

        sts     channel_8_counter,current_port_l        ;2
        sts     channel_8_counter+1,current_port_h      ;2

other_H_channel_analyse:                                ;*8
        ;...

        ;sbis    hardware_interrupts_flags,terminate_flag ;1
        rjmp    main_cy                                  ;2

        ;service of counters may be use registers
        ;
        ;temporary_l
        ;temoprary_h
        ;current_port_l
        ;current_port_h
        ;minus_1_container
        ;_3_byte_counter
        ;
        ;