abstract.txt

这是单片机C51典型应用设计代码

This example runs on the Philips LPC935 and shows:

  * A Timer Interrupt Service Routine (ISR) in C,
  * How to generate Time Delays using the Timer ISR,
  * and How to generate DTMF output on DAC1.

This Example may be debugged using only the uVision Simulator
and your PC--no additional hardware or evaluation boards are
required.  The Simulator provides cycle-accurate simulation
of all on-chip peripherals of the LPC900 device family.

The Logic Analyzer built into the simulator may be used to
monitor and display any variable or peripheral I/O register.
It is already configured for this example to show the timing
of the DTMF output.

The Performance Analyzer (which is also built into the simulator)
graphically displays the time spent in each function.  You may
use this tool to determine which functions require the most CPU
time and which functions must be optimized for performance.

For users with EPM900 or MCB900 hardware, you may download the
application into Flash ROM.  Refer to www.keil.com/mcb900 for
more information.

Technical background about the algorithm used is documented in
Application Note 178: Programming and Debugging of Analog 
Signal Processing Algorithms which is available at
www.keil.com/appnotes.