AVR STK500 User Guide - Atmel

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Hardware Description 3.2 Description of User Switches 3-2 AVR STK500 User Guide 1925C–AVR–3/03 Figure 3-2. Implementation of LEDs and LED Headers VTG LEDn LED0 LED2 LED4 LED6 GND LED1 LED3 LED5 LED7 VTG Note: The AVR can source or sink enough current to drive a LED directly. In the STK500 design, a transistor with two resistors is used to give the same amount of light from the LED, whatever the target voltage (VTG) may be and to turn off the LEDs when VTG is missing. The switches connected to the debug headers are implemented as shown in Figure 3-3. Pushing a switch causes the corresponding SWx to be pulled low, while releasing it will result in VTG on the appropriate switch header connector. Valid target voltage range is 1.8V < VTG < 6.0V. Figure 3-3. Implementation of Switches and Switch Headers SW n 10K 150R +5V 150R VTG 10K SW n SW0 SW2 SW4 SW6 GND Note: In the AVR, the user can enable internal pull-ups on the input pins, removing the need for an external pull-up on the push-button. In the STK500 design, we have added an external 10K pull-up to give all users a logical “1” on SWn when the push-button is not pressed. The 150R resistor limits the current going into the AVR. 1 2 1 2 SW1 SW3 SW5 SW7 VTG
3.3 Connection of LEDs and Switches Figure 3-4. Connection of LEDs and Switches to I/O Port Headers Hardware Description Any I/O port of the AVR can be connected to the LEDs and switches using the 10-wire cables. The headers are supplied with VTG (target V CC ) and GND lines in addition to the signal lines. 3.4 Port Connectors The pinout for the I/O port headers is explained in Figure 3-5. The square marking indicates pin 1. Figure 3-5. General Pinout of I/O Port Headers AVR STK500 User Guide 3-3 Px0 Px2 Px4 Px6 GND 1 2 PORTx Px1 Px3 Px5 Px7 VTG The PORTE/AUX header has some special signals and functions in addition to the PORTE pins. The pinout of this header is shown in Figure 3-6. 1925C–AVR–3/03
Page 1: STK500 ............................
Page 4 and 5: Table of Contents ii AVR STK500 Use
Page 6 and 7: Introduction 1-2 AVR STK500 User Gu
Page 8 and 9: Getting Started 2.3 Quick Start The
Page 10 and 11: Getting Started 2-4 AVR STK500 User
Page 14 and 15: Hardware Description 3-4 AVR STK500
Page 16 and 17: Hardware Description 3.6 Descriptio
Page 18 and 19: Hardware Description 3.7 Target Soc
Page 22 and 23: Hardware Description 3.7.2.1 Parall
Page 24 and 25: Hardware Description 3.7.2.2 Serial
Page 26 and 27: Hardware Description 3.8.1 Target V
Page 28 and 29: Hardware Description 3.8.3 Reset Se
Page 30 and 31: Hardware Description 3.8.4 Clock Se
Page 40 and 41: Installing AVR Studio 4-2 AVR STK50
Page 42 and 43: Using AVR Studio 5.3 STK500 User In
Page 44 and 45: Using AVR Studio 5.3.3 “LockBits
Page 46 and 47: Using AVR Studio 5-6 AVR STK500 Use
Page 48 and 49: Using AVR Studio 5.3.6.1 Setting Up
Page 50 and 51: Using AVR Studio 5-10 AVR STK500 Us
Page 52 and 53: In-System Programming of an Externa
Page 54 and 55: Troubleshooting Guide 7-2 AVR STK50
Page 56 and 57: Technical Support 8-2 AVR STK500 Us
Page 58 and 59: Example Applications 9-2 AVR STK500
Page 60 and 61: Appendix A 10-2 AVR STK500 User Gui

AVR STK500 User Guide - Atmel

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