ATtiny12:

1. pb5 ~rst		<- pgm, <- c-gnd, r-vcc
2. pb3 xt1		-- nc
3. pb4 xt2		-- nc
4. gnd			-- gnd

5. pb0 mosi/ain0	-> ledr, <- mosi
6. pb1 miso/int1/ain1	-> ledg, -> miso
7. pb2 sck/t0		-> ledb, <- sck
8. vcc			-- vcc

PC Port:

1. gnd			-- 4
2. rst			-> 100r -> k 1n4148 a -> 1
3. sck			-> 7
4. miso			<- 6
5. mosi			-> 5

LED Transistor:

1. e			-- vcc
2. b			<- 1k <- a 1n4148 k <- mcu
3. c			-> 560r -> led
