Atmel STK200, Manual

Page: 31 / 40

Board Applications
STK200 Starter Kit 9-5
9.6 Using LCD
Connections
The header marked LCD next to the 28-pin socket, is for a standard 2 x 16 LCD. The
connections are shown on the board and in the following table.
The board is designed for use with a LCD with a Hitachi driver chip built-in, using a con-
trast pin voltage of 0 to 5 Volts. The pot next to the LCD connector, not marked AREF, is
used for contrast adjustment.
If you use a different LCD driver, it may have a different voltage contrast range. In order
to accommodate this, add a resistor to the board, and cut track on underside of board—
marked cut. See diagram above.
This board is not designed for use with back lit LCD modules, so the extra connections
needed are not included and the power supply will not supply the current required.
The LCD can be driven in Memory Mapped or I/O Mode—see data sheet. If the crystal
has been changed to a faster crystal frequency, memory mapped operations will not
work.
9.7 Using RS232
The connection supplied is a 9-way female D-type, therefore, a “straight through” lead is
required—not a null-modem cable.
Jumper JP3 must be closed or RXD will be disabled. RXD and TXD are on pins PD0
and PD1. It is recommended that these switches are disconnected by removing the
Connection Name Function
0V Ground
+5 V
CC
- must be 5V
Vo Contrast
RS Register Select- A14
Wr Not Write
E Enable
D0 Data Bit 0
D1 Data Bit 1
D2 Data Bit 2
D3 Data Bit 3
D4 Data Bit 4
D5 Data Bit 5
D6 Data Bit 6
D7 Data Bit 7
TOP EDGE OF BOARD
EXTRA RESISTOR TO
INCREASE CONTRAST.
TRACK UNDER BOARD
MARKED CUT MUST
BE CUT IF THIS
RESISTOR IS USED
LCD CONTRAST POT