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Cluck is a Common Lisp library to help automate clock and divisor
selections for microcontrollers.

Functions include:

1. show-timers
    Shows range of frequency and periods for 8 and 16-bit timers
    for a given clock frequency

2. ms-timer
    Shows prescaler, compare values, and percent errors
    for 8 and 16 times to acheive desired millisecond compare interrupts.

3. avr-uart-divisors / pic-uart-divisors
    Shows optimal divisors and percent error for common baud
    for serial communications

4. zero-error-uart-clocks
    Display common crystal frequencies that have zero uart timin errors
    for common serial communication rates