AVR533: Migrating from ATtiny2313 to ATtiny2313A 8-bit Microcontrollers 1 Introduction In order to optimize the manufacturing process and to further reduce current consumption, an optimized version of ATtiny2313 has been introduced. Application Note The ATtiny2313A is a functionally identical, drop-in replacement for the ATtiny2313. All devices are subject to the same qualification process and same set of production tests, but as the manufacturing process is not the same some electrical characteristics differ. ATtiny2313 and ATtiny2313A have separate datasheets. This application note outlines the differences between the two devices and the datasheets. There is also a detailed change log to assist the user at the end of the ATtiny2313A datasheet. Remember to always use the latest revision of the device datasheet. Minor differences in typical characteristics are not discussed in this document as long as the low and high limits remain the same. For detailed information about the typical characteristics, see sections “Electrical Characteristics” and “Typical Characteristics” of the device datasheets. Note: This application note serves as a guide to ease migration. For complete device details, always refer to the most recent version of the ATtiny2313A data sheet. Rev. 8261B-AVR-04/10 2 Changes in Characteristics This section outlines such differences in characteristics that may have an effect on the application in which the device is used. For detailed information, refer to the most recent version of the device data sheets. 2.1 Current Consumption Active and Idle mode current consumption of the device have been reduced. The table below present typical current consumption figures at room temperature. All values are taken from device datasheets. Table 2-1. Typical Current Consumption of Device at Room Temperature Mode Active Idle Condition ATtiny2313 ATtiny2313A Change VCC = 2V, f = 1 MHz 250 µA 200 µA -20 % VCC = 3V, f = 4 MHz 1.5 mA 1.2 mA -20 % VCC = 5V, f = 8 MHz 5 mA 3.6 mA -28 % VCC = 2V, f = 1 MHz 80 µA 30 µA -62 % VCC = 3V, f = 4 MHz 410 µA 250 µA -39 % VCC = 5V, f = 8 MHz 1.6 mA 1.0 mA -38 % 2.2 Reset The table below summarizes the differences between the reset circuitry of ATtiny2313 and that of ATtiny2313A. Table 2-2. Changes in Power-On Reset ATtiny2313 Symbol Min Max Unit Min Typ Max VPOR 1.2 1.1 1.4 1.6 V VPOA 1.1 0.6 1.3 1.6 V 0.01 - - V/ms SRON 2 Typ ATtiny2313A AVR533 8261B-AVR-04/10 AVR533 3 New or Updated Bits and Registers In Table 3-1 are listed registers and bits that have been added or changed to the device as a result of functional enhancements. Some bits were marked as reserved in ATtiny2313 and some bits have another use in ATtiny2313A. Table 3-1. New or Updated Bits and Registers in ATtiny2313A Addr. Name 0x07 BODCR 0x06 PRR 0x05 PCMSK2 0x04 PCMSK1 0x03 UCSRC 0x00 USIBR Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 PRTIM1 Bit 2 PRTIM0 Bit 1 Bit 0 BODS BODSE PRUSI PRUSART PCINT17 PCINT16 PCINT15 PCINT14 PCINT13 PCINT12 PCINT11 PCINT10 PCINT9 PCINT8 UMSEL1 UMSEL0 USI Buffer Register Table 3-2 lists interrupt vectors that have been added to ATtiny2313A. Depending on how the firmware is constructed the below additions may have an effect on the start address of the program. Table 3-2. New Interrupt Vectors in ATtiny2313A Vector Address Source 20 0x013 Pin Change Interrupt Request A 21 0x014 Pin Change Interrupt Request D For more details on the functional enhancements, see ATtiny2313A datasheet. 4 Datasheet Changes For a summary of changes, see the revision history at the end of the ATtiny2313A data sheet. 3 8261B-AVR-04/10 Disclaimer Headquarters International Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Asia Unit 1-5 & 16, 19/F BEA Tower, Millennium City 5 418 Kwun Tong Road Kwun Tong, Kowloon Hong Kong Tel: (852) 2245-6100 Fax: (852) 2722-1369 Atmel Europe Le Krebs 8, Rue Jean-Pierre Timbaud BP 309 78054 Saint-Quentin-enYvelines Cedex France Tel: (33) 1-30-60-70-00 Fax: (33) 1-30-60-71-11 Atmel Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Technical Support [email protected] Sales Contact www.atmel.com/contacts Product Contact Web Site www.atmel.com Literature Request www.atmel.com/literature Disclaimer: The information in this document is provided in connection with Atmel products. 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