mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 174
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Analog-to-Digital Converter (S08ADC12V1)
9.3.2
The ADCSC2 register controls the compare function, conversion trigger, and conversion active of the
ADC module.
9-8
ADTRG
ADACT
ACFGT
ACFE
Field
1
7
6
5
4
Bits 1 and 0 are reserved bits that must always be written to 0.
Reset:
W
R
Status and Control Register 2 (ADCSC2)
Conversion Active. Indicates that a conversion is in progress. ADACT is set when a conversion is initiated and
cleared when a conversion is completed or aborted.
0 Conversion not in progress
1 Conversion in progress
Conversion Trigger Select. Selects the type of trigger used for initiating a conversion. Two types of triggers are
selectable: software trigger and hardware trigger. When software trigger is selected, a conversion is initiated
following a write to ADCSC1. When hardware trigger is selected, a conversion is initiated following the assertion
of the ADHWT input.
0 Software trigger selected
1 Hardware trigger selected
Compare Function Enable. Enables the compare function.
0 Compare function disabled
1 Compare function enabled
Compare Function Greater Than Enable. Configures the compare function to trigger when the result of the
conversion of the input being monitored is greater than or equal to the compare value. The compare function
defaults to triggering when the result of the compare of the input being monitored is less than the compare value.
0 Compare triggers when input is less than compare value
1 Compare triggers when input is greater than or equal to compare value
ADACT
7
0
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
ADTRG
Figure 9-3. Status and Control Register 2 (ADCSC2)
0
6
Table 9-5. ADCSC2 Register Field Descriptions
ACFE
0
5
ACFGT
0
4
Description
0
0
3
0
0
2
R
Freescale Semiconductor
0
1
1
R
0
0
1
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