Figure 31 on page 24 of the TCA9539PWR datasheet shows data being written to both Output Port 0 and Output Port 1 in the same I2C operation.
My question is, can I write to only Output Port 0 without writing to Output Port 1 (i.e. issue a stop command after the first byte of data)? Or am I forced to write to both output ports?
Hey Ro,
"My question is, can I write to only Output Port 0 without writing to Output Port 1 (i.e. issue a stop command after the first byte of data)?"
-Yes, you can stop sending data after the first byte. (Writing to Output Port1 is not required)
"Or am I forced to write to both output ports?"
-Not required.
Figure 31 is meant to show that this device has an AI (auto increment) feature which works in register pairs (input|output|configuration|polarity) and is important for the designer/user to understand it is there.
Thanks,
-Bobby
