CMOS Keyboard Encoder
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ CMOS Peripherals
CDP1871A,CDP1871AC
~VDD
, " t SliiFT
J 38 1 CONTRO...
Description
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 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
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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 microprocessor 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 o...
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