Analog-to-Digital Converter (ADC12B12CV1) Block Description
MC9S12XHY-Family Reference Manual, Rev. 1.01
336
Freescale Semiconductor
10.3.2.12 ATD Conversion Result Registers (ATDDRn)
The A/D conversion results are stored in 12 result registers. Results are always in unsigned data
representation. Left and right justification is selected using the DJM control bit in ATDCTL3.
If automatic compare of conversions results is enabled (CMPE[
n
]=1 in ATDCMPE), these registers must
be written with the compare values in left or right justified format depending on the actual value of the
DJM bit. In this case, as the ATDDR
n
register is used to hold the compare value, the result will not be
stored there at the end of the conversion but is lost.
Attention, n is the conversion number, NOT the channel number!
Read: Anytime
Write: Anytime
NOTE
For conversions not using automatic compare, results are stored in the result
registers after each conversion. In this case avoid writing to ATDDRn except
for initial values, because an A/D result might be overwritten.
10.3.2.12.1
Left Justified Result Data (DJM=0)
10.3.2.12.2
Right Justified Result Data (DJM=1)
Module Base +
0x0010 = ATDDR0, 0x0012 = ATDDR1, 0x0014 = ATDDR2, 0x0016 = ATDDR3
0x0018 = ATDDR4, 0x001A = ATDDR5, 0x001C = ATDDR6, 0x001E = ATDDR7
0x0020 = ATDDR8, 0x0022 = ATDDR9, 0x0024 = ATDDR10, 0x0026 = ATDDR11
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
Bit 11 Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 10-14. Left justified ATD conversion result register (ATDDRn)
Module Base +
0x0010 = ATDDR0, 0x0012 = ATDDR1, 0x0014 = ATDDR2, 0x0016 = ATDDR3
0x0018 = ATDDR4, 0x001A = ATDDR5, 0x001C = ATDDR6, 0x001E = ATDDR7
0x0020 = ATDDR8, 0x0022 = ATDDR9, 0x0024 = ATDDR10, 0x0026 = ATDDR11
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
0
0
0
0
Bit 11 Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bi1 1
Bit 0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 10-15. Right justified ATD conversion result register (ATDDRn)
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