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| PXS20RM Datasheet, PDF (195/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller | |||
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ADC_EOC
ADC_ER
DMA
ADC_WD
Analog-to-Digital Converter (ADC)
CTU
TRIGGER_0
CH_0
NEXT_CMD_0
ADC_PUSH_0
ADC_DATA_0
TRIGGER_1
CH_1
NEXT_CMD_1
ADC_PUSH_1
ADC_DATA_1
ADCD_0
ADCD_1
ADCA_0
ADC 0
ADCA_1
ADC 1
DMA
ADC_WD
ADC_ER
ADC_EOC
Figure 9-43. CTU/ADC interface
9.4.2 Analog channel conversion
Two conversion modes are available within the ADCDig:
⢠Normal conversion
⢠Injected conversion
9.4.2.1 Normal conversion
This is the normal conversion that the user programs by configuring the normal conversion mask registers
(NCMRs). Each channel can be individually enabled by setting â1â in the corresponding NCMR field.
Mask registers must be programmed before starting the conversion and cannot be changed until the
conversion of all the selected channels ends (MSR[NSTART] is cleared).
9.4.2.2 Start of normal conversion
The MSR[NSTART] status bit is automatically set when the normal conversion starts. At the same time
the MCR[NSTART] bit is cleared, allowing the software to program a new start of conversion. In that case
the new requested conversion starts after the running conversion is completed.
Freescale Semiconductor
PXS20 Microcontroller Reference Manual, Rev. 1
9-37
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