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PICDEM2 数据表(PDF) 40 Page - Microchip Technology

部件名 PICDEM2
功能描述  simple board
PDF  60 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

PICDEM2 数据表(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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