1. The header file format of ICCAVR is:
#include
2. There is an important header file in the use of AVR microcontrollers, macros.h, which defines some commonly used macros, such as BIT(X), watchdog reset, on/off global interrupts, etc.
3. Bit operation of AVR microcontroller: AVR does not have the usage of sbit like 51 microcontroller, but it can also operate on a single I/O port. The specific method is as follows:
DDRB | =(1<<3); DDRB | =BIT(3); DDRB | =BIT(DDRB3) ——all are different ways of setting the 3rd bit (starting from bit 0) of DDRB to 1.
4. Four bit operations: bitwise AND, bitwise OR, bitwise negation, bitwise XOR
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