PICDEM2 datasheet(44/60 Pages) MICROCHIP

44 / 60 page

 2001 Microchip Technology Inc.

DS30374D-page 39

LCD Demo

6.2.3.

DEC_TABL Routine (kbd8bit.asm)

This routine is basically a look-up table that returns the ASCII value of the

received keypress.

6.2.4.

LCDInit Routine (lcd8bit.asm)

This routine initializes the LCD module.

Figure 6.9: LCD Initialization Routine

6.2.5.

SetupDelay Routine (lcd8bit.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.

6.2.6.

SendCmd Routine (lcd8bit.asm)

This routine sends a command to the LCD.

6.2.7.

BusyCheck Routine (lcd8bit.asm)

This routine checks the LCD busy flag. It returns only when not busy.

6.2.8.

SendChar Routine (lcd8bit.asm)

This routine sends a character to the LCD.

8-bit interface

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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