With CSTARTADD = 0 and EOS in MCTL4, the ADC will do conversions according to MCTL0, MCTL1, MCTL2, MCTL3, and MCTL4, from inputs A0, A0, A0, A0, and A4. This is probably not what you want. The only bit set in the IE register is bit 4, so you should get an interrupt after MEM4 has been written.
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