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PICDEM2 Datenblatt(PDF) 39 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) 39 Page - Microchip Technology

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PICDEM 2 User’s Guide
DS30374D-page 34
 2001 Microchip Technology Inc.
6.1
4-Bit Interface
6.1.1.
Main Routine (kbd4bit.asm)
The program initializes the ports, keypress variables and LCD, then goes into
an infinite loop where it looks for keypresses from the keyboard. When it
receives one, it relays the ASCII value of the key to the LCD routine for
display, then returns to look for another keypress.
Figure 6.4: Main Routine
Start
Configure PORTA,B,D
Initialize Keypress variables
Initialize LCD module
Keypress occurred?
Yes
No
(LCDInit)
Check for keypress
Display key on LCD
(ScanKbd)
(SendChar)



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