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+5V
GND
Vee
VSS
15
-
XTAll
16
_
XTAl2
17
__
- RESET
13
_T1
8049
8049
8748
8021"
8035
8039
8022*
APPLICATION EXAMPLES
P10 18
Pl1 19
P12 20
Pt3
21
P14 22
P15
23
P16 24
P17 25
.20...,2;::-6
---I
A
P21
27
P22 1
P23
,2
>
CLR
'-t---+1
DISPLAY
AND/OR
KEYBOARD
ARRAY
14LSl64
1141
This is most useful when the outputs
of
the
74LS164 eight-bit shift register will be used to
scan a display
and/or
keyboard. In this case an
ANLD
P7,
A with A =
OFFH
can be used
to
load
the initial "1" and an ANLD
P6,
Awith
A =OFEH
can be used
to
move it down the shift register.
POQ
12
POt
13
P02 14
POl 15
P04 16
P05
17
POG
18
P07
19
'PIN
NUMBERS ARE DIFFERENT FOR 8021, 8022
ADDING OUTPUT FOR KEYBOARD/DISPLAY SCANNING
5-16