27220 Parallax Inc, 27220 Datasheet - Page 84

• Manufacturer Part Number: 27220
• Description: BOOK STAMPWORKS
• Manufacturer: Parallax Inc

Specifications of 27220

• Accessory Type: Booklet
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: StampWorks
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

controllers are compatible with it. When in doubt, be sure to download and examine
the driver documentation for an LCD that does not work properly with these
programs.
Modes of Operation
There are two essential modes of operation with character LCDs: writing a character
on the LCD, and sending a command to the LCD (to clear the screen, for example).
When sending a character, the RS line is high and the data sent is interpreted as a
character to be displayed at the current cursor position. The code sent is usually the
ASCII code for the character to be displayed. Several non-ASCII characters also are
available in the LCD ROM, as well as up to eight user-programmable custom
characters (stored in an area called CGRAM).
Commands are sent to the LCD by taking the RS line low before sending the data.
Several standard commands are available to manage and manipulate the LCD
display.
Connecting the LCD
The standard parallel LCD has a 14-pin IDC connector at the end of its cable. The
connector is “keyed” so that it is always inserted correctly into the PDB. Simply align
the connector key (small bump) with the slot in X1 and press the connector into the
socket until it is firmly seated.
Clear
Home
Cursor Left
Cursor Right
Display Left
Display Right
$01
$02
$10
$14
$18
$1C
Clears the LCD and moves cursor to first position of first line
Moves cursor to first position of first line
Moves cursor to the left
Moves cursor to the right
Shifts entire display to the left
Shifts entire display to the right