AVR STK500 User Guide - Atmel

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Using AVR Studio 5.3.3 “LockBits” Settings Similar to the “Fuses” tab, the “LockBits” tab shows which lock modes are applicable to the selected device. All lock bits are accessible in both ISP and High-voltage Programming. A lock mode may consist of a combination of setting multiple Lock bits. This is handled by the STK500 user interface, and the correct lock bits are programmed automatically for the selected lock mode. Once a Lock mode protection level is enabled, it is not possible to lower the protection level by selecting a “lower” degree of protection or by setting a different Lock mode. The only way to remove a programmed Lock bit is to perform a complete chip erase, erasing both program and data memories. One exception exists: If the target device has a programmed “EESAVE” fuse, the contents of the EEPROM will be saved even though a complete chip erase on the device is performed. 5.3.4 “Advanced” Settings 5-4 AVR STK500 User Guide 1925C–AVR–3/03 Figure 5-4. LockBits The “Advanced” tab is currently divided into two subgroups. 5.3.4.1 Signature Bytes By pressing the “Read Signature” button, the signature bytes are read from the target device. The signature bytes act like an identifier for the part. After reading the signature, the software will check if it is the correct signature according to the chosen device. Please refer to the AVR datasheets to read more about signature bytes.
5.3.4.2 Oscillator Calibration Byte 5.3.4.3 Reading Oscillator Calibration Byte 5.3.4.4 Writing Oscillator Calibration Byte Figure 5-5. Advanced Using AVR Studio The oscillator calibration byte is written to the device during manufacturing, and cannot be erased or altered by the user. The calibration byte is a tuning value that should be written to the OSCCAL register in order to tune the internal RC oscillator. By pressing the “Read Cal. Byte” button, the calibration value is read from the device and is shown in the “Value” text box. Note that the calibration byte is not directly accessible during program execution and must be written to a memory location during programming if it shall be used by the program. If this option is grayed out, the selected device does not have a tunable internal RC oscillator. Since the calibration byte is not directly accessible during program execution, the user should write the calibration byte into a known location in Flash or EEPROM memory. Do this by writing the desired memory address in the “Write Address” text box and then press the “Write to Memory” button. The calibration byte is then written to the memory indicated by the “Flash” and “Eeprom” radio buttons. 5.3.5 “Board” Settings The “Board” tab allows the changing of operating conditions on the STK500 development board. The following properties can be modified: VTARGET, AREF and oscillator frequency. The interface is very flexible and it is possible to force the operating conditions beyond the recommended specifications for the device. Doing this is not recommended, and may damage the target device. The recommended operating conditions for the part are stated in the device datasheet. AVR STK500 User Guide 5-5 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 12 and 13: Hardware Description 3.2 Descriptio
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 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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