Part Number
|
CDP1871A |
Manufacturer
|
Intersil Corporation |
Description
|
CMOS Keyboard Encoder |
Published
|
Mar 23, 2005 |
Detailed Description
|
CDP1871A, CDP1871AC
REFERENCE APP NOTE 7374
August 1996
CMOS Keyboard Encoder
Description
The CDP1871A is a keyboard en...
|
Datasheet
|
CDP1871A
|
Overview
CDP1871A, CDP1871AC
REFERENCE APP NOTE 7374
August 1996
CMOS Keyboard Encoder
Description
The 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 (Figure 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 is available for user-selectable debounce times.
The Nkey lock-out feature prevents unwanted key codes if two or more keys are pressed simultaneously.
The CDP1871A a...
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