PXD20RM Datasheet, PDF (143/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Chapter 5
Analog-to-Digital Converter (ADC)
5.1 Overview
5.1.1 Device-specific features
• 10-bit resolution
• 20 channels, expandable to 27 channels via external multiplexing
• Minimum conversion time of 1 µs
• Conversion triggering sources:
— Software
— PIT channel 2 (used to trigger normal conversion)
— PIT channel 3 (used to trigger injection conversion)
• Two different sampling and conversion time registers CTR[1:2] (extended internal channels,
external channels)
• As many as 23 data registers for storing converted data. Conversion information, such as mode of
operation (normal, injected), is associated to data value.
• Conversions on external channels managed in the same way as internal channels, making it
transparent to the application
• External decode signals (3 bits) to control the external analog multiplexers
• One Shot/Scan Modes
• Chain Injection Mode
• Hardware-triggered DMA transfer requests
• Power-down mode
• 2 different Abort functions allow to abort either single-channel conversion or chain conversion
• 4 programmable analog watchdogs with interrupt capability
— Allows continuous hardware monitoring of as many as 4 analog input channels
— Alternate analog thresholds
• Auto-clock-off
PXD20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor
5-1
Preliminary—Subject to Change Without Notice