Hey
i am working for some big project and i have Consume all pins
So i want to use anotherAVR
Connect two AVR
Hey
i am working for some big project and i have Consume all pins
So i want to use another
It'd be simpler (coding especially) to just use a bigger microcontroller. But to answer your question you connect can their SPI ports together but then you have to deal with all the coding for them to understand each other- something you don't have to do if you just use a bigger chip.Originally Posted by kemo0o
Hey
i am working for some big project and i have Consume all pins
So i want to use another
in my country only 40-pin is available ^_*
So i must use it
you can also do multiplexing to save on pins
its agood idea
External Latches(74HC374, 74HC259) can be used for outputs. Multiplexers(74HC257) can be used for inputs. Analog switches(74HC4066) can be used for analog inputs. You can also use either type of shift register, PISO or SIPO for inputs and outputs, and you can find peripherals with SPI or I2C interfaces. I guess the schools in your country neglect to mention the basics, which is why only 40 pin chips are available there.
Last edited by Papabravo; 2nd March 2008 at 01:10 PM.
We never have time to do it right; but we always have time to do it over.
Hey
i am working for some big project and i have Consume all pins
So i want to use another
I really encourages you to use the USART. (which is the synchronous UART!) this way you don't have to deal with baude rates, etc, just connect tow micro controllers working at the same frequency, send data bytes from here to there, and build a routine to handle those data bytes.
I built that system with two 89s52's, and it worked perfectly, One of them was the master, and the other handeled all the line following and motor control issues, in the line follower robot (that you know about, since i was in the same university you are in now!!
Ibrahim Kamal
check my electronics and robotics page: http://www.ikalogic.com/
Really the question is far too vague to answer, specific requirements have specific solutions, and there's no specific information given here.
To give one specific example, you might have a need to scan a multiplexed keypad?, which uses a considerable number of I/O pins, so you could use a separate processor to do the scanning, and a single pin serial connection to the main processor.
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk
I really encourages you to use the USART. (which is the synchronous UART!) this way you don't have to deal with baude rates, etc, just connect tow micro controllers working at the same frequency, send data bytes from here to there, and build a routine to handle those data bytes.
I built that system with two 89s52's, and it worked perfectly, One of them was the master, and the other handeled all the line following and motor control issues, in the line follower robot (that you know about, since i was in the same university you are in now!!
i will use it really
when i finish i will told u
thanks for help
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