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PICDEM2 Folha de dados(PDF) 39 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) 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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