The HCS12X microcontroller family offers many enhancements over the
HCS12 family; principal among these is the XGate peripheral processor. The
XGATE is a programmable core that operates independently of the main CPU,
has access to all of the S12X peripherals, and features a RISC instruction set.
This application note describes how to configure and use the XGATE.
The document begins with a discussion of the issues surrounding data
coherency in dual core systems and how these can be addressed by software.
It goes on, in the following section, to provide some general information and
advice on how to set up and initialize the XGATE module.
Finally, it describes the XGATE’s various power saving modes, and provides a
comparison of their capabilities and differences.