PXS30 Datasheet, PDF (15/139 Pages) Freescale Semiconductor, Inc – PXS30 Microcontroller

Introduction
— External ADC input, taking into account values set in ADC high and low limit registers
• DMA support
1.5.20.2 Cross Triggering Unit (CTU)
The CTU provides automatic generation of ADC conversion requests on user selected conditions without
CPU load during the PWM period and with minimized CPU load for dynamic configuration.
The CTU implements the following features:
• Cross triggering between ADC, FlexPWM, eTimer, and external pins
• Double-buffered trigger generation unit with as many as eight independent triggers generated from
external triggers
• Maximum operating frequency lower than or equal to platform
• Trigger generation unit configurable in sequential mode or in triggered mode
• Trigger delay unit to compensate the delay of external low-pass filter
• Double-buffered global trigger unit allowing eTimer synchronization and/or ADC command
generation
• Double-buffered ADC command list pointers to minimize ADC-trigger unit update
• Double-buffered ADC conversion command list with as many as twenty-four ADC commands
• Each trigger has the capability to generate consecutive commands
• ADC conversion command allows controlling ADC channel from each ADC, single or
synchronous sampling, independent result queue selection
• DMA support with safety features
1.5.20.3 Analog-to-Digital Converter (ADC)
• Four independent ADCs with 12-bit A/D resolution
• Common mode conversion range of 0–5 V or 0–3.3 V
• Twenty-two single-ended input channels
• Supports eight FIFO queues with fixed priority
• Queue modes with priority-based preemption; initiated by software command, internal, or external
triggers
• DMA and interrupt request support
1.5.20.4 eTimer module
Three 16-bit general purpose up/down timer/counters per module are implemented with the following
features:
• Ability to operate up to platform frequency
• Individual channel capability
— Input capture trigger
— Output compare
PXS30 Microcontroller Data Sheet, Rev. 1
Freescale Semiconductor
Preliminary—Subject to Change Without Notice
15