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MC9S12GRMV1 Datasheet, PDF (483/1292 Pages) Freescale Semiconductor, Inc – MC9S12G Family Reference Manual and Data Sheet | |||
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Analog-to-Digital Converter (ADC10B12CV2)
13.3.2.7 ATD Status Register 0 (ATDSTAT0)
This register contains the Sequence Complete Flag, overrun ï¬ags for external trigger and FIFO mode, and
the conversion counter.
Module Base + 0x0006
7
R
SCF
W
6
5
4
3
2
1
0
0
CC3
CC2
CC1
CC0
ETORF
FIFOR
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 13-9. ATD Status Register 0 (ATDSTAT0)
Read: Anytime
Write: Anytime (No effect on (CC3, CC2, CC1, CC0))
Table 13-16. ATDSTAT0 Field Descriptions
Field
7
SCF
5
ETORF
4
FIFOR
Description
Sequence Complete Flag â This ï¬ag is set upon completion of a conversion sequence. If conversion
sequences are continuously performed (SCAN=1), the ï¬ag is set after each one is completed. This ï¬ag is cleared
when one of the following occurs:
A) Write â1â 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
External Trigger Overrun Flag â While in edge sensitive mode (ETRIGLE=0), if additional active edges are
detected while a conversion sequence is in process the overrun ï¬ag is set. This ï¬ag is cleared when one of the
following occurs:
A) Write â1â 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
Result Register Overrun Flag â This bit indicates that a result register has been written to before its associated
conversion complete ï¬ag (CCF) has been cleared. This ï¬ag is most useful when using the FIFO mode because
the ï¬ag 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 ï¬ag is cleared when one of the following occurs:
A) Write â1â 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 ï¬ag was still set)
MC9S12G Family Reference Manual, Rev.1.23
Freescale Semiconductor
485
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