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ATtiny2313 Fuse Programming

CS-423 Dick Steflik. ATtiny2313 Fuse Programming. Whats a Fuse. Fuses are used to hold important configuration information for the MPU Not really a fuse, just a few really important bytes of memory 1 means unprogrammed, 0 means programmed unlike a fuse they can be reprogrammed

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ATtiny2313 Fuse Programming

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  1. CS-423 Dick Steflik ATtiny2313Fuse Programming

  2. Whats a Fuse • Fuses are used to hold important configuration information for the MPU • Not really a fuse, just a few really important bytes of memory • 1 means unprogrammed, 0 means programmed • unlike a fuse they can be reprogrammed • on the ATtiny2313 there are 3 fuse bytes • low byte (lbyte)‏ • high byte (hbyte)‏ • extended byte (ebyte)‏

  3. Low Byte • 7 (0) – CKDIV8 – Divide Clock by 8 • 6 (1) – CKOUT – Output clock on CKOUT pin • 5 (1) – SUT1 – Select start-up time • 4 (0) – SUT0 – Select start-up time • 3 (0) – CKSEL3 – Select clock source • 2 (1) – CKSEL2 – Select clock source • 1 (0) – CKSEL1 – Select clock source • 0 (0) – CKSEL0 – Select clock source

  4. Note: Default Low Byte • Default Low Byte value is 0x64 • Divide clock by 8 • Internal RC Oscillator (8 MHz)‏ • This means default speed is 1 MHz

  5. Select Start-up time • Default value (1 0) results in Maximum start-up time

  6. Clocking Options- CKSEL 3..0 • 0000 – External Clock • 0010 – Internal RC Oscillator (4 Mhz)‏ • 0100 – Internal RC Oscillator (8 Mhz)‏ • 0110 – Watchdog Oscillator (128 KHz)‏ • 1000-1111 – External Chrystal/Ceramic Resonator • 0001,0011,0101,0111 - Reserved

  7. High Byte • 7 (1) – DWEN – debugWIRE Enable • 6 (1) – EESAVE – EEPROM is preserved during chip erase • 5 (0) – SPIEN – SPI Enable • 4 (1) – WDTON – Watchdog timer always on • 3 (1) – BODLEVEL2 – brownout detector trig level • 2 (1) – BODLEVEL1 – brownout detector trig level • 1 (1) – BODLEVEL0 – brownout detector trig level • 0 (1) – RSTDISBL – External Reset disable

  8. Brownout Detection Trigger Level • The ATtiny2313 has an On-chip Brown-out Detection circuit that monitors Vcc to fixed trigger levels • Programmed by BODLEVEL 2..0 Fuses 1 1 1 BOD disabled 1 1 0 1.8 v 1 0 1 2.7 v 1 0 0 4.3 v

  9. Extended Byte • 7 (1) – not used • 6 (1) – not used • 5 (1) – not used • 4 (1) – not used • 3 (1) – not used • 2 (1) – not used • 1 (1) – not used • 0 (1)– SELFPRGEN – Self programming Enable

  10. Fuse Programming • Can be done through the Studio GUI if you are using the Atmel programmer • AVRDUDE & Parallel Port programmer • Use the -U option as follows: Avrdude -p Attiny2313 -c dapa -v -U lfuse:w:0xE4

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