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PDF CDP1871AC Data sheet ( Hoja de datos )
| Número de pieza | CDP1871AC | |
| Descripción | CMOS Keyboard Encoder | |
| Fabricantes | GE | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CDP1871AC (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ CMOS Peripherals
CDP1871A,CDP1871AC
~VDD
, " t SliiFT
J 38 1 CONTROL
4 37t--- ALPHA
3'5f-- DEBOUNCE
06-- 6
" 33 ............. DA
f--32f-- BUS 7
31 BUS (;
3O~BUS"
29>-- BUS 4
2Bf-- BlJS 3
::3::'-"'E"" 26 - BBUUSS2!
~~; 0
19 22 C52
20 21 e5i
TOP VIEW
TERMINAL ASSIGNMENT
CMOS Keyboard Encoder
Features:
• Directly interfaces with COP1BOO-series microprocessors
• Low power dissipation
• 3-state outputs
• Scans and generates code for 53 key ASCII keyboard plus 32 HEX keys
(SPST mechanical contact switches)
• Shift, control, and alpha lock inputs
• RC-controlled debounce circuitry
• Single 4 to 10.5 V supply (COPIB71A); 4 to 6.5 V (COPIB71AC)
• N-key lockout
The RCA-CDP1871A is a keyboard encoder designed to
directly interface between a CDP1800-series micro-
processor and a mechanical keyboard array, providing up
to 53 ASCII coded keys and 32 HEX coded keys, as shown in
the system diagram (Fig. 1).
The keyboard may consist of simple single-pole single-
throw (SPST) mechanical switches. Inputs are provided for
alpha-lock, control, and shift functions, allowing 160 unique
codes. An external R-C input isavailable for user-selectable
debounce times. The N-key lock-out feature prevents
unwanted key codes if two or more keys are pressed
si multaneously.
The CDP1871A and CDP1871AC are functionally identical.
They differ in that the CDP1871A has a recommended
operating voltage range of 4 to 10.5 volts, and the
CDP1871AC has a recommended operating voltage range
of 4 to 6.5 volts. These types are supplied in 40-lead dual-in-
line ceramic packages (D suffix), and 40-lead dual-in-line
plastic packages (E suffix), and 44-lead plastic chip-carrier
packages (Q suffix).
..
...
TP' f---_..,34~TP'
CDP1800- SE'RIES
CPU
CDPIB71A
.-L4V~DD
SHIFT
BUSO - BUS-'
~TROLI
~CONTROL
IALPHA LOCK
'---<>
'
37
ALPHA
92CL-35
Fig. 1 - Typical COP1BOO-series microprocessor system using the COP1871A.
File Number 1374
417
1 page  
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ CMOS Peripherals
CDP1871 A, CDP1871 AC
TABLE 3 - DRIVE AND SENSE LINE KEYBOARD CONNECTIONS*
SENSE
LINES
S,
S2
S,
S4
S.
S.
S7
S.
0
SP 0
0
:..,.'.,:
...:,'
",
:'.':
!1
.........
1 .:.',';",:'
"2
2 I:
#3
3
$ ..4..
4
%5
5
&6
6
7
7
0
(8
8 ....:....
)9
.9
:
+;
;
<
=-
-
>
?/
/
0,
@
@ NUL
AA
a SOH
BB
b STX
CC
c ETX
DD
d EOT
EE
e ENQ
FF
f ACK
GG
9 BEL
DRIVE LINES
04 D. D. 0 7 Oat
H H P P X X SPACE 80,.
h BS P DLE X CAN
I I QQY Y
i HT q DC1 Y EM
81,.
J
J RRZ Z
LINE
82,.
j LF r DC2 z SUB FEED
KKSS I
[ ESCAPE 83,.
k
L
VT
L
5
T
DC3
T
[,,
ESC
\
84, •
I FF t DC4 \ FS
MM
m CR
NN
n SO
UU I
u NAK I
V V-
v SYN I
I
CARRAIGE
85,.
GS RETURN
I
86,.
RS
0 0 W W DEL -
DELETE 87,.
0 SI w ETB - US
D9t
88,.
89,.
8A,.
8B,.
8C,.
8D,.
BE,.
BF,.
D,ot
90,.
91,.
92,.
93,.
94,.
95,.
96,.
97,.
D11t
98,.
99,.
9A,.
9B,.
9C,.
9D,.
9E,.
9F,.
D'CONTROL overrides SHIFT and ALPHA
= NO RESPONSE
III
:j:Showlng ASCII outputs for all combinations With and Without SHIFT, ALPHA LOCK and CONTROL
tDrive lines 8, 9,10, and 11 generate non-ASCII hex values which can be used for special codes
TABLE 4 - HEXIDECIMAL VALUES OF ASCII CHARACTERS
MSD
b7- 0 0 o o
b6--. 0
0
oo
BITS
bS" 0 1 o
Ht:A
o
b4 b3 b2 b1 r - 0 1 2 3 4 S
oo0 o 0
NUL
DLE
SP
o
@
P
oo0 1
1
SOH
DC1
AQ
oo1 o 2
STX
DC2
2 BR
oo1 1
3
ETX DC3
#
3
C
S
o1 0 o 4
EOT
DC4
$
4
D
T
o1 0 1
5
ENQ
NAK
%
5
EU
o1 1 o 6
ACK
SYN
&
6
FV
LSD o 1 1 1
7
BEL ETB
7 Gw
ooo 8
BS CAN
BHX
oo
9 HT EM }
9
Y
o
oA
LF SUB
z
o
B
VT ESC
+
K
oo C
FF FS
<L \
o D CR GS
M
oE
SO RS
>N
F SI US
?o
1
1
o
67
\p
aq
b
c5
d
eu
v
9w
hx
y
z
k
m
n
o DEL
____________________________________________________________ 421
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CDP1871AC.PDF ] | |
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