PXD20 Datasheet, PDF (17/130 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

1.4.21 Analog-to-digital converter (ADC)
The ADC features the following:
• 10-bit A/D resolution
• 0–5 V or 0–3.3 V common mode conversion range
• Supports conversions speeds of up to 1s
• 20 internal and 8 external channels support
• Up to 20 single-ended inputs channels
— 10 channels configured as input only pins
– 10-bit ± 2 counts accuracy (TUE)
— 10 channels configured to have alternate function as general purpose input/output pins
– 10-bit ± 3 counts accuracy (TUE)
• External multiplexer support to increase up to 27 channels
— Automatic 1 × 8 multiplexer control
— External multiplexer connected to a dedicated input channel
— Shared register between the 8 external channels
• Result register available for every non-multiplexed channel
• Configurable Left or Right aligned result format
• Supports for one-shot, scan and injection conversion modes
• Injection mode status bit implemented on adjacent 16-bit register for each result
— Supports Access to Result and injection status with single 32-bit read
• Independently enabling of function for channels:
— Pre-sampling
— Offset error cancellation
— Offset Refresh
• Conversion Triggering support
— Internal conversion triggering from periodic interrupt timer (PIT)
• Four configurable analog comparator channels offering range comparison with triggered alarm
— Greater than
— Less than
— Out of range
• All unused analog pins available as general purpose input pins
• Selected unused analog pins available as general purpose pins
• Power Down mode
• Optional support for DMA transfer of results
Overview
1.4.22 Serial Peripheral Interface (SPI)
The SPI modules provide a synchronous serial interface for communication between the MCU and external devices.
The SPI features:
• Full duplex, synchronous transfers
• Master or slave operation
• Programmable master bit rates
• Programmable clock polarity and phase
• End-of-transmission interrupt flag
• Programmable transfer baud rate
PXD20 Microcontroller Data Sheet, Rev. 2
Freescale Semiconductor
Preliminary—Subject to Change Without Notice
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