DOC1925 datasheet(29/61 Pages) ETC1

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Hardware Description

AVR STK500 User Guide

3-19

1925C–AVR–3/03

Figure 3-25. RESET Jumper Options

The STK500 master microcontroller controls the RESET signal to the target AVR. The

RESET signal is accessible on the PORTE/AUX header; this pin can also be used for

external RESET signal. Figure 3-26 shows the internal connection of the RESET signal.

Figure 3-26. Internal RESET Connection

Note:

During High-voltage Programming, STK500 applies 12V to the AVR’s RESET

line. Thus, an external reset circuit not capable of handling this must be discon-

nected before High-voltage Programming the AVR.

AREF

RESET

XTAL1

Jumper Mounted

AREF

RESET

XTAL1

Jumper not Mounted

On-board RESET Signal Disconnected

On-board RESET Signal Connected (default)

PE1

RST

GND

XT2

VTG

PE0

PE2

REF

XT1

GND

1 2

Master

MCU

RESET NET

0V - VTG - 12V

RESET

CIRCUIT

RESET

PORTE/AUX

RESET

Jumper

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