Rabbit 6000 User’s Manual
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242
23.3 Dependencies
23.3.1 I/O Pins
The A/D converter is physically separated from the multiplexer on the chip. The multiplexer accepts inputs
on pins IN7–IN0, and outputs the selected channel on MUXOUT. The A/D converter accepts input on
VIN. If desired, conditioning circuitry can be placed between MUXOUT and VIN, or they can simply be
connected directly.
External voltage references can be used with the multiplexed A/D converter; if enabled they should be
supplied on REF+ and REF-.
The PD4 pin can be used as a clock input instead of the peripheral clock.
23.3.2 Clocks
The A/D converter can be clocked by the peripheral clock divided by 2, 4, 8, 16, 32, 64, 128, or 256, or by
a clock input on PD4, depending on the value set in ADCCR. Exercise care when selecting the clock to
keep the data rate below the maximum sample rate of the component you are configuring.
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