27220 Parallax Inc, 27220 Datasheet - Page 98

• 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

EXPERIMENT #13: READING THE LCD RAM
This program demonstrates the use of the LCD’s CGRAM space as external memory.
Look It Up: PBASIC Elements to Know
Building the Circuit
Use the same circuit as in Experiment #11.
Program: SW21-EX13-LCD_Read.BSP
' {$STAMP BS2}
' {$PBASIC 2.5}
' -----[ Program Description ]---------------------------------------------
'
' This program demonstrates how to read data from the LCD's display RAM
' (DDRAM) or character RAM (CGRAM).
'
' The connections for this program conform to the BS2p-family LCDCMD,
' LCDIN, and LCDOUT instructions.
' or BS2sx.
' -----[ I/O Definitions ]-------------------------------------------------
E
RW
RS
LcdDirs
LcdBusOut
LcdBusIn
' -----[ Constants ]-------------------------------------------------------
LcdCls
LcdHome
LcdCrsrL
LcdCrsrR
LcdDispL
LcdDispR
•
INS, INL, INH, INA - IND
There is a separate program for the BS2p, BS2pe, and BS2px.
PIN
PIN
CON
VAR
VAR
VAR
CON
CON
CON
CON
CON
CON
1
2
3
DIRB
OUTB
INB
$01
$02
$10
$14
$18
$1C
Use this program for the BS2, BS2e,
' Enable pin
' Read/Write
' Register Select
' bus DDR
' 4-bit LCD data bus
' clear the LCD
' move cursor home
' move cursor left
' move cursor right
' shift chars left
' shift chars right