Analog-to-Digital Converter (ADC12B16CV2)
MC9S12G Family Reference Manual Rev.1.27
550 NXP Semiconductors
16.3.2.7 ATD Status Register 0 (ATDSTAT0)
This register contains the Sequence Complete Flag, overrun flags for external trigger and FIFO mode, and
the conversion counter.
Read: Anytime
Write: Anytime (No effect on (CC3, CC2, CC1, CC0))
Module Base + 0x0006
76543210
R
SCF
0
ETORF FIFOR
CC3 CC2 CC1 CC0
W
Reset00000000
= Unimplemented or Reserved
Figure 16-9. ATD Status Register 0 (ATDSTAT0)
Table 16-16. ATDSTAT0 Field Descriptions
Field Description
7
SCF
Sequence Complete Flag — This flag is set upon completion of a conversion sequence. If conversion
sequences are continuously performed (SCAN=1), the flag is set after each one is completed. This flag is cleared
when one of the following occurs:
A) Write “1” to SCF
B) Write to ATDCTL5 (a new conversion sequence is started)
C) If AFFC=1 and a result register is read
0 Conversion sequence not completed
1 Conversion sequence has completed
5
ETORF
External Trigger Overrun Flag — While in edge sensitive mode (ETRIGLE=0), if additional active edges are
detected while a conversion sequence is in process the overrun flag is set. This flag is cleared when one of the
following occurs:
A) Write “1” to ETORF
B) Write to ATDCTL0,1,2,3,4, ATDCMPE or ATDCMPHT (a conversion sequence is aborted)
C) Write to ATDCTL5 (a new conversion sequence is started)
0 No External trigger overrun error has occurred
1 External trigger overrun error has occurred
4
FIFOR
Result Register Overrun Flag — This bit indicates that a result register has been written to before its associated
conversion complete flag (CCF) has been cleared. This flag is most useful when using the FIFO mode because
the flag potentially indicates that result registers are out of sync with the input channels. However, it is also
practical for non-FIFO modes, and indicates that a result register has been overwritten before it has been read
(i.e. the old data has been lost). This flag is cleared when one of the following occurs:
A) Write “1” to FIFOR
B) Write to ATDCTL0,1,2,3,4, ATDCMPE or ATDCMPHT (a conversion sequence is aborted)
C) Write to ATDCTL5 (a new conversion sequence is started)
0 No overrun has occurred
1 Overrun condition exists (result register has been written while associated CCFx flag was still set)
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