User's Manual Part 1

Board overview
Wireless Sensing Triple Axis Reference design, Rev. 0.9
Freescale Semiconductor 29
Figure 4-3ZSTAR USB stick board software overview
For the USB stick board operation, several MCHC908JW32 hardware modules are used: USB 2.0
Full-speed module (USB), Synchronous Peripheral Interface (SPI), Keyboard Interrupt module (KBI) and
a General Purpose Input/Output (GPIO).
SMAC
low-level USB
Sensor & Button data
USB connection to PC
USB protocol
ZSTAR RF protocol handler
MCHC908JW32
USB 2.0
“virtual serial port”
software
Serial Peripheral Interface
(SPI) module
KBI GPIO
Full Speed module
MC39
protocol driver
or mouse
handler
simple STAR
protocol handler