I2C ON P89C51RD2(Philips micro controller)

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Erik

See Keil's app note 153 and supporting code.

If you don't have an actual I2C controller on your device, then you'll have to emulate one by using software to toggle a couple of programmable I/O pins to produce the right output waveforms. In that case, you'll probably also want the Philips I2C bus spec.

1. means we can implement CLK & DATA lines
using port bits say in p89c51rd2 we can take port1(programmable).is it correct?

2. u r mentioning that special PHILIPS BUS is needed.can't we take some low impedence wire?

we can implement CLK & DATA lines
using port bits say in p89c51rd2 we can take port1(programmable).is it correct?
In The P89C51RD2 port 1 bits 6 and 7 are open collector for precisely this purpose.

u r
no, the wire does not need to be microohms

Erik

Yes, I meant that you could use PIO pins such as those on port 1 as the clock and data lines for the I2C interface. Software will have to toggle the two pins appropriately to make it look like an I2C transaction to the other device(s).

I suggested that you might want the Philips I2C spec simply so that you'd be sure how to program your emulated I2C interface. I wasn't even thinking of the physical connection, but rather the logical waveforms that need to appear on those two pins.