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SYSTEM
OPERATION
t 1 t t t 1
1 1
! ! 1 1
~~
MANUAL
RESET
'"
0
o
..
o 0
II!
It!
It>
"-
..L...
GND
1«
"
RESeT
0
...J
en en
5l
iii
I-
I-
It>
<.D
~
«
....
~
...J
0
~ ~
l-
I-
"
iN
-
:x :x
en
en
en
I-
-
" "
"
f
8085A
Xl
I-
~-::-
---
:;)
Q
0
~
~
I-
0
>
I:E
w
.r
0
X2
0
w
I~
I~
en
~
«
N M
~
I.t)
0
...J
§
W
00
...J
W
:;(
:;(
:;(
:;(
:;(
«
'"
"
« u
"
..
iI-
1 !
lh
(8)
¢
(3)
z:
(
o·
I
....
)
ISEE
NOTE 2
()
:
Vee
t
PROG/CE
Vee-
CE
READY
•
CLK
Vee~
i'6R
A
S
·A
lO
..
8355/8755A
RESET
101M
WR
RO
ALE
PAo·PA
7
A
\..
AD
o
·AD
7
....
y
PB
O
·PB
7
I
I
GND
Vee
CE
VCC VCC
~)
)
8156
SEE
NOTE
4
RESET
101M
WR
RD
ALE
A
"-
"IIi
~
/
AD
O
·AD
7
....
..
I
NOTE
1:
TRAP,INTR,AND
HOLD
MUST BE GROUNDED IF
THEY
AREN'T
USED.
GND
NOTE
2:
USE
101M FOR
STANDARD
110 MAPPING.
USE
A15
FOR
MEMORY
MAPPED
I/O.
NOTE
3. CONNECTION IS NECESSARY
ONLY
IF ONE TWA IT STATE IS DESIRED.
NOTE
4:
PULL·UP RESISTORS RECOMMENDED
TO
AVOID
SPURIOUS SELECTION WHEN
AD
AND
WR
ARE
3·STATED. THESE RESISTORS
ARE
NOT
INCLUDED
ON THE
PC
BOARD
LAYOUT
OF FIGURE 3·7.
FIGURE 3·6 MINIMUM 8085 SYSTEM
3·8
PAo·PA
7
pBo'p~
PCo,PCs
TIMER
IN
TIMER
OUT
I
VCC
..
PORT A (8)
PORT B (8)
..
PORTA
(8)
...
PORT B (8)
..
PORT C (6)
...
..
)
..