Re: My question was why is it 8 bit words in i2c not in spi?
Hi,
SPI usually is 8 bits, too.
But because of it´s hardware you could use any other bit width, too.
Additionally you could adjust bit width with any selected device. No need that all devices at one SPI bus use the same bit width.
But I recommend to keep on 8 bit width, if possible. Just for tracability and compatibility. (Unfortunately some devices need other bit width than 8)
With I2C you have a specified protocol. Any device at the bus has to comply with it.
Klaus