Philips CEM2100/00 Service Manual page 336

17. 10-bit AD Converter (ADC)
17.2 Register configuration
Note 1: The ADCDR2<EOCF> is cleared to "0" when reading the ADCDR1. Therfore, the AD conversion result should be read to
ADCDR2 more first than ADCDR1.
Note 2: The ADCDR2<ADBF> is set to "1" when AD conversion starts, and cleared to "0" when AD conversion finished. It also is
cleared upon entering STOP mode or SLOW mode .
Note 3: If a read instruction is executed for ADCDR2, read data of bit3 to bit0 are unstable.
EOCF AD conversion end flag
ADBF AD conversion BUSY flag
0: Before or during conversion
1: Conversion completed
0: During stop of AD conversion
1: During AD conversion
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