Version 4
SHEET 1 880 680
WIRE 96 -80 80 -80
WIRE 112 -80 96 -80
WIRE 96 -64 96 -80
WIRE -480 -16 -656 -16
WIRE 16 -16 -480 -16
WIRE -512 16 -656 16
WIRE 16 16 -512 16
WIRE -544 48 -656 48
WIRE 16 48 -544 48
WIRE 240 48 176 48
WIRE -576 80 -656 80
WIRE 16 80 -576 80
WIRE 240 80 176 80
WIRE -240 112 -256 112
WIRE -224 112 -240 112
WIRE 240 112 176 112
WIRE -240 128 -240 112
WIRE 240 144 176 144
WIRE 240 176 176 176
WIRE -480 192 -480 -16
WIRE -320 192 -480 192
WIRE 16 192 -160 192
WIRE -512 224 -512 16
WIRE -320 224 -512 224
WIRE 16 224 -160 224
WIRE -544 256 -544 48
WIRE -320 256 -544 256
WIRE 16 256 -160 256
WIRE -576 288 -576 80
WIRE -320 288 -576 288
WIRE 16 288 -160 288
WIRE -320 336 -656 336
WIRE 16 352 -16 352
WIRE -16 368 -16 352
WIRE -16 368 -32 368
WIRE 0 368 -16 368
WIRE -240 384 -240 368
WIRE -240 384 -256 384
WIRE -224 384 -240 384
WIRE -16 384 -32 368
WIRE -16 384 0 368
WIRE -240 400 -256 384
WIRE -240 400 -224 384
WIRE 96 400 96 384
WIRE 96 400 80 400
WIRE 112 400 96 400
WIRE 96 416 80 400
WIRE 96 416 112 400
FLAG 96 -80 Vdd
FLAG 96 400 Vss
FLAG 240 176 Y0
IOPIN 240 176 Out
FLAG 240 144 Y1
IOPIN 240 144 Out
FLAG 240 112 Y2
IOPIN 240 112 Out
FLAG 240 80 Y3
IOPIN 240 80 Out
FLAG 240 48 Y4
IOPIN 240 48 Out
FLAG -16 368 Vss
FLAG -656 80 A0
IOPIN -656 80 In
FLAG -656 48 A1
IOPIN -656 48 In
FLAG -656 16 A2
IOPIN -656 16 In
FLAG -656 -16 A3
IOPIN -656 -16 In
FLAG -656 336 CLK
IOPIN -656 336 In
FLAG -240 384 Vss
FLAG -240 112 Vdd
SYMBOL 4bitreg -320 368 R0
WINDOW 0 64 -210 Left 0
SYMATTR InstName X1
SYMBOL 4bitadder 16 384 R0
WINDOW 0 60 -385 Left 0
SYMATTR InstName X2