MC44817 Help

[joblessalex]

I've been messing around with an old tuner which says it is IIC compatible. I'm assuming that is the wire library in arduino, right? So I made up a test program to pull all device IDs since one wasn't listed and got nothing. I assumed it didn't need one and went on to build a basic bit of code to program it to 101.100MHz which is a complete failure. Anyone out there that can tell me what I'm doing wrong?
Datasheet: http://pdf1.alldatasheet.com/datasheet-pdf/view/167872/MOTOROLA/MC44817.html

Code:

Code: [Select]

  #include <Wire.h>



  void write_to_pll() {

  digitalWrite(12, HIGH);
  //  Wire.beginTransmission(); //Maybe needed?
 Wire.write(1111); // buffer
    Wire.write(0000010011111); // frequency
    Wire.endTransmission();
      digitalWrite(12, LOW);
  }


  void setup()
  {
    pinMode(12, OUTPUT);
    Wire.begin(); // initialise the connection
    Serial.begin(9600);
    write_to_pll();
    delay(10); //add a small delay

    Serial.println("Memory written");
  }

  void loop()
  {


  }

[dannyf]

I'm assuming ...
 I assumed

Why assume when you have the datasheet right there? Read it and you will know that why your assumption is wrong.

[joblessalex]

I'm assuming ...
 I assumed

Why assume when you have the datasheet right there? Read it and you will know that why your assumption is wrong.

Read it again and still see IIC  with 18, 19, or 34 bit protocol... Where are you seeing any different?

[c4757p]

The Data and Clock inputs may be shared with other inputs on the IIC–Bus

Data and Clock Inputs are IIC Bus Compatible

There is no mention in the datasheet of the I2C protocol: start bits, stop bits, address, etc. It appears to be only electrically compatible with the I2C bus. "Data, clock and enable" seems more like SPI to me. I'd say it's just a poorly written datasheet. Not an I2C device.

[free_electron]

Its just a stupid shift register. Shift in 18 bits and done.
Datasheet is pretty clear to me.

[dannyf]

Read it again and still see IIC  with 18, 19, or 34 bit protocol...

I think you are right. It is probably similar to those "parallel spi" protocols, .

[joblessalex]

Being a new player, I would have never guessed that.... Thanks for the help guys!

[dannyf]

I would have never guessed

Why guess if you can read about it for sure?