In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

Kramer,

A. Yes - filters simply filter, or suppress a certain frequency, or a frequency range, or filer out (select) a certain frequency, supressing other frequencies. I assume that you have acquired selective filters. These usually are used in superhet radio receivers for filtering the so-called "intermediate" frequency (IF). That is - whatever RF frequency you want to receive, it will be mixed down to the IF, so the signal can be amplified by an amplifier designed for just one frequency, the IF. Theoretically, you can use such filters for oscillators as well but I think the SX-internal oscillator circuit is not capable of driving such filters.

B. It seems to me that this component is a complete active oscillator. It will need a power supply (Vdd and Vss) connected to two of its pins, and it will generate a 24MHz clock signal on one of the remaining pins. This signal can be fed into the SXes OSC1 pin (OSC2 remains unconnected in this case). So, this operates as an external oscillator.

C. Yes, it looks to me that these are crystals possibly requiring extenal capacitors. I would try the crystals w/o additional capacitors first - just connect the two pins to OSC1 and OSC2 and see if the SX is clocked by running a simple LED blinker program.

What Parallax boards are aou referring to? If you are using a SX48/52 Proto Board, you may be lucky and item #2 fits into the provided socket. BTW, Parallax did a good "design trick" here. You can't plug in the SX-Key, as long as the oscillator module is plugged in. IOW, you need to unplug the oscillator module before connecting the SX-Key because both items must not be connected to the SX at the same time.

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