Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

atmega32 avr c programming code

Status
Not open for further replies.
boukamoha

boukamoha

Member level 5
Joined
Aug 3, 2012
Messages
85
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Activity points
1,891
hi every one
can some one tell me the difference between setting the portB of ATMEGA32 as PORTB=0b11111110; and PORTB &=(1<<PB0) and PORTB &=0b11111110
best regards
 

Code C - [expand]
1
2
3
4
5
6
7
8
9
10
11
12
13
14

PORTB = 0b11111110;      // assigning a value to PORTB unconditionally
 
PORTB &=0b11111110;      // reading PORTB and MASKING OUT the LSB bit ONLY
PORTB = PORTB & 0xFE;      // same statement written differently
 
PORTB &= (1<<PB0);      // isn't correct if it should be the same as the previous statement
// it reads as PORTB = PORTB & 0x01 (1<<PB0) is (1<<0) or bit shift (0) positions(s)...
 
PORTB &= ~(1<<PB0);      // if you want the same effect as the previous statement
 
// so to set a bit
PORTB |= (1<<PB0);
// to clear a bit
PORTB &= ~(1<<PB0);
 
Last edited by a moderator:

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top