If the external pull-up resistor is too strong (i.e << 4.7kOhm), STK600 may not be able to pull the RESET line low.
See also:
Reset Line
when programming an external target.
Port Connectors
All I/O port pins on the target AVR mounted on the STK600 are available on port pin connectors. These are labeled PORTA, PORTB, PORTC etc.
Depending to the AVR in use, different ports will be available.
The picture below shows PORTA. Here, all port pins PA0 to PA7 are available, in addition to the target voltage VTG and GND.
The other port connectors are identical, only with different signal names.
Cables can be mounted between the port connectors and the other peripherals on the board, or to external hardware.
AUX port connector
The AUX connector is located in the port connector area. The figure shows the pinout for the connector.
The following signals are available:
AREF0
Analog Reference voltage. This pin is connected to the AREF pin on devices having a single separate analog reference pin. For devices with two
AREF pins, this pin in connected to the AREF+ pin. The AREF0 voltage is controlled from the PC software if the AREF0 jumper is mounted.
AREF1
Analog Reference voltage. This pin is connected to the AREF- pin on devices having two separate analog reference pin. The AREF1 voltage is
controlled from the PC software if the AREF1 jumper is mounted.
XTAL1
The XTAL1 signal on the AVR is routed to this pin. If the CLOCK switch is set to the INT position, this pin can be used to apply an external clock
signal.
XTAL2
The AVR's XTAL2 pin. If the CLOCK switch is set to the INT position, this pin can be used for external crystal with the XTAL1 pin.
RESET
The RESET pin on the AVR is available on this pin.
32KHz
A 32kHz clock signal is available on this pin. It can be connected to a device's TOSC1 pin in order to implement a real-time clock. Place a jumper
between the 32KHz pin and the neighboring TOSC1 pin.
TOSC2 and TOSC1
For AVRs with a timer that can be clocked from an external low-frequency crystal, these two pins are available. The TOSC1 pin can easily be
connected to the AUX port's 32KHz pin (32kHz clock signal) by a jumper.
Page 13 of 35
STK600 User Guide
2008-06-20
file://C:\Documents and Settings\PAWEL\Ustawienia lokalne\Temp\~hhE369.htm
