AVR MCU IO usage details overview-EEWORLD

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　　The main content introduces the detailed usage of AVR microcontroller IO

　　The relationship between the AVR microcontroller register DDRx PORTx PINx and the corresponding IO port (x represents a port, such as port A, port B, etc.)

　　The following table uses the second bit PB2 of port B as an example and assumes that PB2 is floating.

DDRB.2	PORTB.2	Read the result of PINB.2	Status of pin PB2
1	1	1	PB2 push-pull output 1
1	0	0	PB2 push-pull output 0
0	1	1	PB2 weak pull-up, can be used as input
0	0	×	PB2 high impedance, can be used as input

　　When reading PINB.2, the actual level of the PB2 pin is read.

　　If PB2 is directly connected to VCC, then the result of reading PINB.2 at any time is 1

　　If PB2 is directly connected to GND, then the result of reading PINB.2 at any time is 0

Reference address：AVR MCU IO usage details overview

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