Thanks, guys.

I tried to use two port pin to bit-bang the data to non-I2C device. It worked. The only problem is that bit-bang speed is not fast enough, so I changed to use Uart0 mode 0 sending the data out, it worked pretty good.

Why I asked that question is if there is no port pins and uart left,only two I2C pins left, we still want to send the data out to non-I2C device, I try to find some ways to do it. If there is a CPU with non-I2C device, we can use software to pick up start bit, and then only use data bits, if there is no CPU on the device, I thought Bartosz 's hardware solution maybe the best.


Thanks.

Frank