PXS20RM Datasheet, PDF (159/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Chapter 9
Analog-to-Digital Converter (ADC)
Analog-to-Digital Converter (ADC)
9.1 Introduction
The analog-to-digital converter (ADC) block provides accurate and fast conversions for a wide range of
applications.
This device includes two ADC modules, referred to as ADC_0 and ADC_1.
External ADC channels:
• 9 external channels on ADC_0 (channels 0..8)
• 9 external channels on ADC_1 (channels 0..8)
• 4 external channels shared between ADC_0 and ADC_1 (channels 11..14)
The internal connections of peripherals to ADC channels are as follows:
• TSENS_0 = ADC_0 channel 15
• TSENS_1 = ADC_1 channel 15
• VREG_1.2V = ADC_0 channel 10 and ADC_1 channel 10
9.2 Features
The ADC contains advanced features for normal or injected conversion. A conversion can be triggered by
software or hardware (CTU).
The ADC on PXS20 supports 16 internally-multiplexed precision channels (ANS), all of which have the
same accuracy.
The mask registers present within the ADC can be programmed to configure which channel has to be
converted.
Conversion timing registers are used to configure different sampling and conversion times. On PXS20,
two such registers are provided — one for configuring the precision channels (0–14) and one for the
temperature sensor channel.
Analog watchdogs allow continuous hardware monitoring.
9.3
Memory map and register descriptions
Table 9-1. Bit access descriptions
Access type
Description
read/write (rw)
read-only (r)
write-only (w)
write 1 to clear (w1c)
Software can read and write to these bits.
Software can only read these bits.
Software can only write to these bits.
Software can clear bits by writing ‘1’.
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor
9-1