參數(shù)資料
型號(hào): PICDEM2
廠商: Microchip Technology Inc.
英文描述: simple board
中文描述: 簡(jiǎn)潔的主板
文件頁(yè)數(shù): 39/60頁(yè)
文件大?。?/td> 1037K
代理商: PICDEM2
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
(LCDInit)
Keypress occurred
Yes
No
Check for keypress
(ScanKbd)
Display key on LCD
(SendChar)
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