HI2CSetup and 24LC512

[nerdegutta]

I've read the manual, but I haven't found any place this is described.

The Setup command is:

HI2CSetup I2CMaster, %1010dddx, I2SFast, I2CWord

When A2, A1 and A0 is grounded on the PCB. What should the ddd look like?

- nerdegutta

 

[rs2845]

If the A2-A0 are all attached to 0v then the 'ddd' will become '000'

So your setup command will be:

Hi2csetup i2cmaster, %1010000x, i2cfast, i2cbyte (or word)

 

[nerdegutta]

OK, thanks.

But what about the x? Use it or not? And what should it be?

- nerdegutta

 

[rs2845]

That x doesn't really mean anything. That just specifies read or write, but by omitting it or putting an x the Picaxe will default to both read and write.

 

[nerdegutta]

I need to have

HI2CSetup I2CMaster, %10100000 I2CSlow, I2CWord

or else the data stored is not read back correctly.

Putting an x in gives an syntax error message.

- nerdegutta

 

[Technical]

Use a 0 in the x position.

 

[nerdegutta]

Thanks.

Have I understood it right that the 24LC512 has one page. Like the 24LC16b has 8 pages?

- nerdegutta

 

[Technical]

Devices that use a byte addressing system can only access 256 bytes of eeprom. That is why some of them use the 3 address bits as well to give you an extra 256 x8 capacity.
Devices that use a word addressing system can access up to 65536 bytes to start with, and hence don't need to work in the same way.

 

[nerdegutta]

Thank you!

- nerdegutta

 

[westaust55]

Keep in mind that when writing to the larger EEPROM chips such as your 24LC512 that there is still paging involved - just it does not use the hardware address pins.
The Datasheet will indicate the page size for writing.
Not a problem when you only write one byte in a i2cwrite/hi2cout statement.
But when you write multiple bytes if you try to write across a page boundary, internally it wraps around back to first byte in the same page and you will corrupt the stored data.