FUJITSU MB91F109 FR30 - Manual (Page 298)

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CHAPTER 11 A/D CONVERTER (Successive approximation type)
If the same channel as that set by ANS2 to ANS0 is set, only one channel is subjected to A/
D conversion (single conversion mode).
After A/D conversion is finished over the channel set by these bits in continuous conversion
or convert-and-stop mode, the A/D converter returns to the start channel set by ANS2 to
ANS0.
When setting the channels, observe the rule that ANE equals or exceeds ANS.
[Example]
ANS sets channel 1 and ANE sets channel 3 in single conversion mode.
A/D conversion is performed from channel 1 to channel 2 and then channel 3.
These bits are initialized to "000" when the register is reset.