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APPLICATION EXAMPLES
+5V GND
I:l~
L
Vee
Voo
Vss
~)
2
Pl0
.-e-
XTALI
Pll
fllL
P12
~
~
P13
30
rll
=r
3
~
I/O
•
XTAL
2
P14
PIS
&-
:~
P16
~
RESET
P17
~
21
+5V GND
7
P20
EA
8049
P21
22
8048
P22
23
40
15
20
11
-==
5
8748
P23
~}
NC-
SS
8035'
P24
~
Vee
Voo
vss
EE
8039'
P25
~
I/O
~
A8
PAO
~
P26
rR-
22
A9
PAl
~
P27
r1lL
23 A10
PA2
~
PA3
27
1
2B
{-
TO
DBO
12
12
ADO
PA4
DBI
13
13
ADI
29
39
PAS
30-
INPUT
~
T1
DB2
14
14 AD2
PA6
DB3
15
15 AD3
'jf-
PA7
=-
INT
DB4
16
16
AD4
DB5
17 17
ADS
8355
&--
PBO
DB6
18 18
AD6
8755A
PBl
~
DB7
19
19
AD7
2K
x 8
PB2
~
ALE
PSEN
PROG
WR
iffi
ROM
PB3
~
125
110
1
8
8
lOR
~
11
9
PB4
10
PBS
&-
lOW
PB6
~
9
PB7
~
I/O
RD
11
ALE
*EA
= 5V FOR 8035/8039
2
+5V_
CE
,
CAN
BE
SUPPLIED BY SYSTEM ---!
RESET
RESET
OR
PORT LINE OF 8048
.E 1
3
1
6
-=-
NC
NC
• External
I/O
ports are addressed as data memory
PA=OO
PB=01
• If
the 8048's internal Program Memory
is
used this configuration will result in
the upper 1 K of
external memory being addressed before the lower 1
K.
Inverting A10 will correct this if necessary. This inversion
is
not necessary
if
the 8049
is
used.
ADDING A PROGRAM MEMORY AND
1/0
EXPANDER
5-8