ATMega chip full datasheet - UCSD Department of Physics

ATmega48A/PA/88A/PA/168A/PA/328/PTable 28-5.Extended Fuse Byte for ATmega88A/88PA/168A/168PAExtended Fuse Byte Bit No Description Default Value– 7 – 1– 6 – 1– 5 – 1– 4 – 1– 3 – 1BOOTSZ1 2BOOTSZ0 1Select Boot Size(seeTable 27-7 on page 292 andTable 27-10 on page 293for details)Select Boot Size(seeTable 27-7 on page 292 andTable 27-10 on page 293for details)0 (programmed) (1)0 (programmed) (1)BOOTRST 0 Select Reset Vector 1 (unprogrammed)Note: 1. The default value of BOOTSZ[1:0] results in maximum Boot Size. See ”Pin Name Mapping” onpage 304.Table 28-6. Extended Fuse Byte for ATmega328/328PExtended Fuse Byte Bit No Description Default Value– 7 – 1– 6 – 1– 5 – 1– 4 – 1– 3 – 1BODLEVEL2 (1) 2 Brown-out Detector trigger level 1 (unprogrammed)BODLEVEL1 (1) 1 Brown-out Detector trigger level 1 (unprogrammed)BODLEVEL0 (1) 0 Brown-out Detector trigger level 1 (unprogrammed)Note: 1. See Table 29-13 on page 324 for BODLEVEL Fuse decoding.Table 28-7.Fuse High Byte for ATmega48A/48PA/88A/88PA/168A/168PAHigh Fuse Byte Bit No Description Default ValueRSTDISBL (1) 7 External Reset Disable 1 (unprogrammed)DWEN 6 debugWIRE Enable 1 (unprogrammed)SPIEN (2) 5Enable Serial Program and DataDownloading0 (programmed, SPIprogramming enabled)WDTON (3) 4 Watchdog Timer Always On 1 (unprogrammed)8271D–AVR–05/11299