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DEMO9S12XHY256
Analog-to-Digital Converter (ADC12B12CV1) Block Description
MC9S12XHY-Family Reference Manual, Rev. 1.04
Freescale Semiconductor
331
10.3.2.9
ATD Status Register 2 (ATDSTAT2)
This read-only register contains the Conversion Complete Flags CCF[11:0].
Read: Anytime
Write: Anytime, no effect
Module Base + 0x000A
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
0
0
0
0
CCF[11:0]
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 10-11. ATD Status Register 2 (ATDSTAT2)
Table 10-18. ATDSTAT2 Field Descriptions
Field
Description
11–0
CCF[11:0]
Conversion Complete Flag n (n= 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) (n conversion number, NOT channel
number!)— A conversion complete flag is set at the end of each conversion in a sequence. The flags are
associated with the conversion position in a sequence (and also the result register number). Therefore in non-fifo
mode, CCF[4] is set when the fifth conversion in a sequence is complete and the result is available in result
register ATDDR4; CCF[5] is set when the sixth conversion in a sequence is complete and the result is available
in ATDDR5, and so forth.
number!)— A conversion complete flag is set at the end of each conversion in a sequence. The flags are
associated with the conversion position in a sequence (and also the result register number). Therefore in non-fifo
mode, CCF[4] is set when the fifth conversion in a sequence is complete and the result is available in result
register ATDDR4; CCF[5] is set when the sixth conversion in a sequence is complete and the result is available
in ATDDR5, and so forth.
If automatic compare of conversion results is enabled (CMPE[n]=1 in ATDCMPE), the conversion complete flag
is only set if comparison with ATDDRn is true and if ACMPIE=1 a compare interrupt will be requested. In this
case, as the ATDDRn result register is used to hold the compare value, the result will not be stored there at the
end of the conversion but is lost.
is only set if comparison with ATDDRn is true and if ACMPIE=1 a compare interrupt will be requested. In this
case, as the ATDDRn result register is used to hold the compare value, the result will not be stored there at the
end of the conversion but is lost.
A flag CCF[n] is cleared when one of the following occurs:
A) Write to ATDCTL5 (a new conversion sequence is started)
B) If AFFC=0, write “1” to CCF[n]
C) If AFFC=1 and CMPE[n]=0, read of result register ATDDRn
D) If AFFC=1 and CMPE[n]=1, write to result register ATDDRn
A) Write to ATDCTL5 (a new conversion sequence is started)
B) If AFFC=0, write “1” to CCF[n]
C) If AFFC=1 and CMPE[n]=0, read of result register ATDDRn
D) If AFFC=1 and CMPE[n]=1, write to result register ATDDRn
In case of a concurrent set and clear on CCF[n]: The clearing by method A) will overwrite the set. The clearing
by methods B) or C) or D) will be overwritten by the set.
0 Conversion number n not completed or successfully compared
1 If (CMPE[n]=0): Conversion number n has completed. Result is ready in ATDDRn.
by methods B) or C) or D) will be overwritten by the set.
0 Conversion number n not completed or successfully compared
1 If (CMPE[n]=0): Conversion number n has completed. Result is ready in ATDDRn.
If (CMPE[n]=1): Compare for conversion result number n with compare value in ATDDRn, using compare
operator CMPGT[n] is true. (No result available in ATDDRn)
operator CMPGT[n] is true. (No result available in ATDDRn)