AVR080: Replacing ATmega103 by ATmega128
■ATmega103 Errata Corrected in ATmega128
■Changes to Names
■Improvements to Timer/Counters and Prescalers
■Improvements to External Memory Interface
■Improvements to the ADC
■Improvements to SPI and UART
■Changes in ADC Noise Canceler
■Changes in EEPROM Write Timing
■Changes to Programming Interface
■Fuse Settings
■Oscillators and Selecting Start-up Delays
■Changes to Watchdog Timer
■JTAG Interface
■Other Concerns
■Features not Available in ATmega103 Compatibility Mode
●Introduction
■This application note is a guide to assist current ATmega103 users in converting exist-ing designs to the ATmega128. The ATmega128 has two operating modes selected through the fuse settings. The M103C Fuse selects whether the ATmega103 compati-bility mode should be used or not. By default, the M103C Fuse is programmed and the ATmega128 operates in compatibility mode. When the compatibility mode is used, only non-conflicting enhancements make the part different from the ATmega103. Additionally, the electrical characteristics of the ATmega128 are different including an increase in operating frequency because of a change in process technology. Check the data sheet for detailed information. When the M103C Fuse is unprogrammed, all new features are supported, but porting the code may require more work.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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01/04 |
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Rev. 2501D–AVR–01/04 |
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121 KB |
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