ME-11 Interfacing
E1
4
2
PB5= A13
PB4= A12
3-to-8 Decoder
74’138
0
1
2
3
4
5
6
7
1
R/W
E2
E3
E
PB7=A15
PB6= A14
Address of output port O1 =________
Address of input port I1 =_________
74HC574 is an 8-bit Flip-Flop
74HC573 is an 8-bit Tri-State Buffer (and/or an 8-bit latch)
>
PC7- PC0
AD7- AD0
O17-O10
PC7-PC0
AD7- AD0
I17-I10
OE
74HC574
74HC573
LE
VCC
74HC573
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