Using the Aardvark adapter with a Microwire device – Total Phase
Using the Aardvark adapter with a Microwire device

What is Microwire?

Microwire is a serial communication interface which is a subset of the SPI serial communication bus. SPI has four different modes of operation which are based on two parameters: the Clock Phase (CPHA) and Clock Polarity (CPOL). For more information about the SPI modes, please refer to SPI Background.

Microwire has a single mode, CPHA=0 (the leading edge is rising and the trailing edge is falling) and CPOL=0 (the sample is on the leading edge and the setup is on the trailing edge).

How to interface a Microwire device

Essentially, the Aardvark I2C/SPI Host Adapter would interface with a Microwire device in the same manner as a regular SPI device. The only difference is the label of the pins.

The Microwire pins are: serial clock (SK), serial in (SI), serial out (SO) and chip select (CS#).

If the Aardvark I2C/SPI Host Adapter is used as a master device to interface with a slave Microwire device, the pins would be connected in the following manner.

SPI
Master
Microwire
Slave
SCLK SK
MOSI SI
MISO SO
SS# CS#

If the Aardvark I2C/SPI Host Adapteris used as a slave device to interface with a master Microwire device, the pins would be connected in the following manner.

SPI
Slave
Microwire
Master
SCLK SK
MOSI SO
MISO SI
SS# CS#

References

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