Description: This example shows how to perform A/D conversion on up to 10
// external channels by showing that channels A8 and A9 can be used for
// conversion of external signals when not using these channels as external
// reference inputs. A single sequence of conversions is performed
// - one conversion on A8 and then one conversion on A9. Each conversion uses AVcc
// and AVss for the references. The conversion results are stored in ADC12MEM0
// and ADC12MEM1 respectively and are moved to 'results' upon completion of
// the sequence. Test by applying voltages to pins VeREF+ for A8 and
// VREF-/VeREF- for A9, then setting and running to a break point at the
// "_BIC..." instruction in the ISR. To view the conversion results, open a
// watch window in debugger and view 'results' or view ADC12MEM0 and ADC12MEM1
// in an ADC12 SFR window.
// This can run even in LPM4 mode as ADC has its own clock
// *NOTE* When using channels A8 and A9 for external signals, internal
// references must be used for the conversions. Refer to figure 17-1 in the
// MSP430x1xx Family User's Guide.