Atmel Studio and IAR Settings

The common settings for Atmel Studio and IAR™ will be listed in this section.

1. The essential fuse settings:
   1. The boot reset vector must be enabled.
   2. Set Low Fuse Byte to use External Clock @ 16 MHz to make the ATmega328PB example (BAUD RATE 38400) download from Atmel START work properly.
2. The SPMCSR register address has to be defined using SPMREG (refer to the table below) macro in reg.h file, this register address will change if the register is located in the indirect memory region, the address of this register can be found in the register summary section of the data sheet.
   Figure 1. Setting SPMREG Address in reg.h
3. Other register addresses defined in reg.h file have to be modified according to the device data sheet.
4. Symbol __RAMPZ__ (refer to the table below) has to be defined in compiler and assembler for the devices with flash size greater than 64 KB.
5. Symbol __MEMSPM__ (refer to the table below) has to be defined in assembler for the devices whose SPMCSR register is located above the direct memory access region (i.e. if SPMCSR register is located above 0x3F). For e.g. ATmega128 has SPMCSR located at 0x68 and hence the definition is required for accessing it.
6. Symbol BOOT_ADDR=<bootloader section start address> (refer to the table below) has to be defined in the compiler for the devices with flash size greater than 64 KB.