  This program is for use with the Bit Wacker from Sparkfun.  The PIC processor used is the Microchip 18F2550 clocked at 20 MHz.  The hex file is loaded into the PIC using Microchips PDFSUB.exe (PICDEM FS USB Demo Tool).  See Sparkfun and Microchip Websites for information.

  The USER.C is the source code for the Si570 control application.  If you want to make PIC program changes, replace the user.c file in the USER folder of the Microchip D_142 source and compile.

  Install softare to create a COM port connection to the Bit Wacker USB and use a communications program such as Hyperterm to send commands.

  The communications to the Si570 is through the I2C port (RB0 & RB1) of the PIC.  Be sure to set the calibration frequency (C command).  Also set the X1 or X4 commands for the frequency multiplier before sending the frequency (F) command to set the frequency. See the commands.txt file.