Basic Micro Studio Syntax Manual

LCD Command Table
Command Value Function
Lcdclear $101 Clear display. Clears all on and off screen ram.
Lcdhome $102 Return to home position.
Inccur $104 Auto increment cursor (default).
Incscr $105 Auto increment display.
Deccur $106 Auto decrement cursor.
Decscr $107 Auto decrement display.
Off $108 Display, cursor and blink OFF.
Scr $10C Display ON, cursor and blink OFF.
Scrblk $10D Display and blink ON, cursor OFF.
Scrcur $10E Display and cursor ON, blink OFF.
Scrcurblk $10F Display, cursor and blink ON.
Curleft $110 Move cursor left.
Currright $114 Move cursor right.
Oneline $120 Set display for 1 line LCDs.
Twoline $128 Set display for 2 line LCDs.
Cgram | address $140 Set CGRAM address for reading or writing.
Scrram | address $180 Set display RAM address for reading or writing.
Commands
LCD Commands
The LCD commands are used to setup the display instead of a separate command. The LCD display
only needs to initialized once. If you are using a 2x16 LCD display you would need to issue the
Twoline command. One of the SCR commands are required to turn the display on. Otherwise data
will be written to the DDRAM but not displayed. The following code snippet turns the screen on, clears
it and moves the cursor to home before printing “Hello World!”.
;DEMO PROGRAM - LCDINIT.BAS
Pause 500
lcdinit p0\p1\p7\p6\p5\p4,p2
lcdwrite p0\p1\p7\p6\p5\p4,p2, [CLEARLCD,HOMELCD,SCR,TWOLINE,”Hello World”]
LCD DDRAM
The HD44780 uses DDRAM to store ASCII characters. The one HD44780 control can handle up to
4x20 ram location, this means one controller can drive up to a 4x20 screen. A 4x40 display would use
two HD44780 controllers. With this in mind a 1x16 or 2x16 screen still has all the ram locations to
make up a 2x20 display. Only certain locations will actually print to the display while the unused can
be written to an characters can be stored for later shifting into the display area. The diagrams below
illustrate how the memory map (DDRAM) is handled for each display.
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