Atmel STK200, Manual

Page: 12 / 40

Hardware Description
4-2 STK200 Starter Kit
4.1 Jumpers and
Links and their
Functions
4.2 External
Connections
All Ports are brought out to edge of board on to headers. Each header has a V
CC
and
Ground pin for power supply to external circuits. Port A for A/D parts is on a separate
header from Port A for standard parts, labeled “Analog”. There is an extra six-pin header
for miscellaneous functions - ICP, OC1B and ALE on 40-pin Digital devices, Reset,
Ground and V
CC
. The external load cannot exceed 100 mA for all headers combined.
See “Using External Connections” on page 9-1 and “Using Analog Parts” on page 9-3
for details.
Jumper Function Open Closed Default
JP1 Voltage select 5V 3.3V Open
JP2 Brown-out select 2.9V 4.5V Closed
JP3 RS232 RXD OFF ON Open
Port B LEDs LEDs Disabled LEDs Enabled Closed
Port D Switches Switches Disabled Switches Enabled Closed
LK1 Analog Reference
See Section 9.4.2 If LK1 cut then
EXTERNAL REF
from header ONBOARD POT Closed
CUT Under
Board LCD Contrast
See Section 9.6 If Cut, add
extra resistor Contrast Pot Closed
Clock Sel Selects Internal or
External Clock for
AT90S2323 INT = Internal Clock EXT = External Clock Closed