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Using AVR Studio

AVR STK500 User Guide

5-5

1925C–AVR–3/03

Figure 5-5. Advanced

5.3.4.2

Oscillator

Calibration Byte

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.

5.3.4.3

Reading Oscillator

Calibration Byte

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 acces-

sible 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.

5.3.4.4

Writing Oscillator

Calibration Byte

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 develop-

ment 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.

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