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CY4672 Reference Design Guide, Document # 001-16968 Revision ** 39
Mouse
rupt API to this module is not used. See the SPI Module on page 40 for how this module is used to
implement communication with multiple devices on the SPI bus.
3.3.2.3 Programmable Interval Timer User Module
The Programmable Interval Timer User Module is configured to use the Internal 32-KHz Low-power
Oscillator. This module is used to provide a periodic interrupt to the timer code module in order to
maintain a power saving millisecond sleep routine. The period of the timer is calibrated to the system
clock at power on in order to provide a period of about 250 µs. This calibration is performed to
account for variations in temperature and ILO variances from part to part. Configured the module to
generate a terminal count interrupt. The period parameter is ignored since it is programmed at run
time based upon the calibration results. See the Timer Module on page 41 for more details on cali-
bration
3.3.2.4 Flash Security
The PSoC Designer mouse project has a file called FlashSecurity.txt. This file specifies access rules
to blocks of the Flash ROM. Refer to the documentation at the top of the file for definitions. This file
is shipped with a single change from its default configuration. The block starting at hex address
1FC0 has been changed from W: Full (Write protected) to U: Unprotected. This location of Flash has
been dedicated to saving non-volatile configuration values for the protocol code module (refer to the
Protocol Module on page 41).
Note When building the mouse firmware, be sure to check that the
text image size does not occupy this block.
3.3.3 Model
Figure 3-6. Firmware Architecture Model
debounce spi
flash radio driver
protocol
poll
timer
isr
mouse optical
testmode
mfgtest
battery
buttons
wheeltick
GPIO
Common
PSoC Lib
Application
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