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PICDEM2 データシート(PDF) 39 Page - Microchip Technology

部品番号 PICDEM2
部品情報  simple board
PDF  60 Pages
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PICDEM2 データシート(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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