mpc5644a Freescale Semiconductor, Inc, mpc5644a Datasheet - Page 14

• Manufacturer Part Number: mpc5644a
• Description: Mpc5644a Microcontroller Data Sheet
• Manufacturer: Freescale Semiconductor, Inc

Overview
1.2.14
The deserial serial peripheral interface (DSPI) block provides a synchronous serial interface for communication between the
MPC5644A MCU and external devices. The DSPI supports pin count reduction through serialization and deserialization of
eTPU and eMIOS channels and memory-mapped registers. The channels and register content are transmitted using a SPI-like
protocol. This SPI-like protocol is completely configurable for baud rate, polarity and phase, frame length, chip select assertion,
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— Provides time stamp information when requested
— Allows time stamp information relative to eTPU clock sources, such as an angle clock
— Parallel interface to eQADC CFIFOs and RFIFOs
— Supports both right-justified unsigned and signed formats for conversion results
40 single-ended input channels, expandable to 56 channels with external multiplexers (supports four external 8-to-1
muxes)
8 channels can be used as 4 pairs of differential analog input channels
Differential channels include variable gain amplifier for improved dynamic range
Differential channels include programmable pull-up and pull-down resistors for biasing and sensor diagnostics
(200 k100 k5 k
Additional internal channels for monitoring voltages (such as core voltage, I/O voltage, LVI voltages, etc.) inside the
device
An internal bandgap reference to allow absolute voltage measurements
Silicon die temperature sensor
— Provides temperature of silicon as an analog value
— Read using an internal ADC analog channel
— May be read with either ADC
2 Decimation Filters
— Programmable decimation factor (1 to 16)
— Selectable IIR or FIR filter
— Up to 4th order IIR or 8th order FIR
— Programmable coefficients
— Saturated or non-saturated modes
— Programmable Rounding (Convergent; Two’s Complement; Truncated)
— Prefill mode to precondition the filter before the sample window opens
— Supports Multiple Cascading Decimation Filters to implement more complex filter designs
— Optional Absolute Integrators on the output of Decimation Filters
Full duplex synchronous serial interface to an external device
— Free-running clock for use by an external device
— Supports a 26-bit message length
Priority based queues
— Supports six queues with fixed priority. When commands of distinct queues are bound for the same ADC, the
— Queue_0 can bypass all prioritization, buffering and abort current conversions to start a Queue_0 conversion a
— Supports software and hardware trigger modes to arm a particular queue
— Generates interrupt when command coherency is not achieved
External hardware triggers
— Supports rising edge, falling edge, high level and low level triggers
— Supports configurable digital filter
higher priority queue is always served first
deterministic time after the queue trigger
DSPI
Preliminary—Subject to Change Without Notice
MPC5644A Microcontroller Data Sheet, Rev. 4
Freescale Semiconductor