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I had another question: None of the implemented logic in the CPLD requires an external oscillator. It's just a 100-bit shift register that sends data out serially when it receives a clock signal from a microcontroller.
So, my question is - does the CPLD still need an external oscillator or can I have a fully working CPLD for my application without one?
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The only clocks you need are the ones your logic uses. There's no "hidden" need for clocks in the CPLD.
So, if I understood your design correctly, the only clock signal you need is the SPI clock provided by the MCU.
As Dave mentioned, the MAX V has an internal oscillator.
However, it's frequency will vary depending on voltage, temperature and from chip to chip.
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