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PICDEM2 Folha de dados(PDF) 40 Page - Microchip Technology

Nome de Peças PICDEM2
Descrição Electrónicos  simple board
PDF  60 Pages
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Fabricante Electrônico  MICROCHIP [Microchip Technology]
Página de início  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PICDEM2 Folha de dados(HTML) 40 Page - Microchip Technology

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 2001 Microchip Technology Inc.
DS30374D-page 35
LCD Demo
6.1.2.
ScanKbd Routine (kbd4bit.asm)
This routine scans the keyboard for a keypress. When it detects one, it returns
the ASCII value of the key.
Figure 6.5: 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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