參數(shù)資料
型號： PICDEM2
廠商： Microchip Technology Inc.
英文描述： simple board
中文描述： 簡潔的主板
文件頁數(shù)： 41/60頁
文件大?。?/td> 1037K
代理商： PICDEM2
PICDEM 2 User
’
s Guide
DS30374D-page 36
2001 Microchip Technology Inc.
6.1.3.
DEC_TABL Routine (kbd4bit.asm)
This routine is basically a look-up table that returns the ASCII value of the
received keypress.
6.1.4.
LCDInit Routine (lcd4bit.asm)
This routine initializes the LCD module.
Figure 6.6: LCD Initialization Routine
6.1.5.
SetupDelay Routine (lcd4bit.asm)
This routine is basically a decrementing variable loop. The variable is
initialized with a value and then decremented in a loop until it reaches zero
value. Then it jumps out of the loop and returns to the calling routine.
6.1.6.
SendCmd Routine (lcd4bit.asm)
This routine sends a command to the LCD. It splits the command into upper
and lower nibbles (4 bits) and sends these to the LCD, upper nibble first.
6.1.7.
BusyCheck Routine (lcd4bit.asm)
This routine checks the LCD busy flag. It returns only when not busy.
6.1.8.
SendChar Routine (lcd4bit.asm)
This routine sends a character to the LCD. It splits the character into upper
and lower nibbles (4 bits) and sends these to the LCD, upper nibble first.
4-bit interface, 2 lines of 5 x 7 characters
Display on, cursor on
Clear display
Set entry mode inc, no shift
Address DDRAM upper left
Send commands to LCD (SendCmd)
Return
Configure PORTA
Configure PORTD
Power-up and Set-up Sequence
(SetupDelay)
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