Imagecraft c compiler and development environment for the atmel avr

ICCV8 for AVR – C Compiler for Atmel AVRio???v.h Header FilesThe naming scheme of the IO registers, bit definitions, and the interrupt vectors arestandardized on these header files. The io????v.h header files define symbolicnames for AVR’s IO registers and bits, interrupt vector numbers, and lock/fuse bits ifsupported (Mega AVRs only). IO register and bit names are defined as in data sheetswith few exceptions and extensions (note that occasionally the summary pages havemisspellings!). The file iccioavr.h conditionally includes all these io????v.h filesdepending on which device macro is defined, which is passed down by the IDE.Therefore, you may write#include and it will work for any supported devices.Some notes about the header files: SREG bits are not defined (not needed in C).UART status flag OR is defined as OVR (old ICCAVR style) and DOR (new megaAVR style).16-bit registers on subsequent addresses (e.g. Timer/Counter1 registers or StackPointer) are defined int as well as char. To use the int definition, simply writethe register name without the L/H suffix, e.g., ICR1. If 16-bit access uses mcu'sTEMP register, ICCAVR creates the correct code sequence by itself. Interrupt vector numbers are defined as in data sheet tables “Reset and InterruptVectors” (source column) with iv_ as a prefix. Use with #pragmainterrupt_handler, for example:#pragma interrupt_handler timer0_handler: iv_TIMER0_OVFFor more information, see Interrupt Handling. With these definitions, you may refer toIO registers by names:... = PINA; // read from PINAThere are some double definitions added to overcome AVR's most irritating syntaxdifferences: UART_RX and UART_RXC (*) UART_DRE and UART_UDRE (*) UART_TX and UART_TXC (*) EE_RDY and EE_READY ANA_COMP and ANALOG_COMP112