MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 428
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MC9S12G
Manufacturer Part Number
MC9S12G
Description
Ignores external trigger. Performs one conversion sequence and stops.
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC9S12G.pdf
(1160 pages)
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Analog-to-Digital Converter (ADC10B16CV2)
428
ETRIGCH[3:0]
ETRIGSEL
SRES[1:0]
SMP_DIS
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
Field
6–5
3–0
7
4
ETRIGSEL
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
External Trigger Source Select — This bit selects the external trigger source to be either one of the AD
channels or one of the ETRIG3-0 inputs. See device specification for availability and connectivity of ETRIG3-0
inputs. If a particular ETRIG3-0 input option is not available, writing a 1 to ETRISEL only sets the bit but has
no effect, this means that one of the AD channels (selected by ETRIGCH3-0) is configured as the source for
external trigger. The coding is summarized in
A/D Resolution Select — These bits select the resolution of A/D conversion results. See
coding.
Discharge Before Sampling Bit
0 No discharge before sampling.
1 The internal sample capacitor is discharged before sampling the channel. This adds 2 ATD clock cycles to
External Trigger Channel Select — These bits select one of the AD channels or one of the ETRIG3-0 inputs
as source for the external trigger. The coding is summarized in
the sampling time. This can help to detect an open circuit instead of measuring the previous sampled
channel.
ETRIGCH3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
Table 13-5. External Trigger Channel Select Coding
SRES1
0
0
1
1
ETRIGCH2
MC9S12G Family Reference Manual,
Table 13-3. ATDCTL1 Field Descriptions
Table 13-4. A/D Resolution Coding
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
SRES0
0
1
0
1
ETRIGCH1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
Table
Description
13-5.
ETRIGCH0
A/D Resolution
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
10-bit data
Reserved
8-bit data
Rev.1.01
Table
13-5.
External trigger source is
ETRIG0
ETRIG1
AN10
AN11
AN12
AN13
AN14
AN15
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
AN8
AN9
Freescale Semiconductor
1
1
Table 13-4
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