Intel MCS48 User Manual page 122

APPLICATION
EXAMPLES
40
,26
,20
15-25pf
Vcc
Vqd
Vss
XTAL
1
8049
8048
8748
TO
T1
INT
P10
P11
P12
P13
P14
P15
P16
P17
P20
P21
P22
P23
P24
P25
P26
P27
DBO
DB1
DB2
DB3
DB4
DB5
DB6
DB7
ALE PSEN
PROG
WR RD
11
25
10
INPUT
AND
OUTPUT
22
23
24
-
PORT
2
INPUT
AND
35
36
LOUTPUTJ
37
38^
_
-
BUS PORT
INPUT
AND
OUTPUT
8
NC NC
•
All
inputs
and
outputs (except
RESET,
X1, X2)
standard
TTL
compatible
• P1
and P2
outputs
drive
5V
CMOS
directly
others
require
10
to
50KH
pullup
for
CMOS
compatibility
XTAL:
Series
Resonant
1
to
6
MHz
or
Parallel
Resonant
for
higher
accuracy
CTS
Knights
MP060
Crystek
CY6B
or equivalent
or
standard
3.58
MHz
TV
Color
Burst
XTAL
THE STAND ALONE
8048/8049
5-2