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PICDEM2 Datenblatt(PDF) 43 Page - Microchip Technology

Teilenummer PICDEM2
Bauteilbeschribung  simple board
PDF  60 Pages
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Hersteller  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PICDEM2 Datenblatt(HTML) 43 Page - Microchip Technology

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PICDEM 2 User’s Guide
DS30374D-page 38
 2001 Microchip Technology Inc.
6.2.2.
ScanKbd Routine (kbd8bit.asm)
This routine scans the keyboard for a keypress. When it detects one, it returns
the ASCII value of the key.
Figure 6.8: Keyboard Scan
Set Row Counter
Blank LEDs
Keypress occurred
Yes
No
on last scan?
No Keypress?
No
Get Row Information
Debounce Key
Display last keypress
on LEDs
Determine column, row of key
and get ASCII value
Return
Yes
(DEC_TABL)



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