MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
19-4
Freescale Semiconductor
— Parallel interface to eQADC CFIFOs and RFIFOs.
— Supports both right-justified unsigned and signed formats for conversion results.
— The REFBYPC pin allows process-independent low variation biasing current.
•
Optional automatic application of ADC calibration constants
— Provision of reference voltages (25%VREF
1
and 75%VREF) for ADC calibration purposes
•
40 input channels available to the two on-chip ADCs
•
Four pairs of differential analog input channels
•
Full-duplex synchronous serial interface to an external device
— A free-running clock is provided for use by the external device.
— Supports a 26-bit message length.
— Transmits a null message when there are no triggered CFIFOs with commands bound for
external command buffers, or when there are triggered CFIFOs with commands bound for
external command buffers but the external command buffers are full.
•
Priority-based CFIFOs
— Supports six CFIFOs with fixed priority. The lower the CFIFO number, the higher its priority.
When commands of distinct CFIFOs are bound for the same ADC, the higher priority CFIFO
is always served first.
— Supports software and several hardware trigger modes to arm a particular CFIFO.
— 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
•
Supports four external 8-to-1 muxes that can expand the input channel number from 40 to 68
•
Upgrades the functionality provided by the QADC
19.1.4
Modes of Operation
This section describes the operation modes of the eQADC.
19.1.4.1
Normal Mode
This is the default operational mode when the eQADC is not in background debug or stop mode.
19.1.4.2
Debug Mode
Upon a debug mode entry request, eQADC behavior will vary according to the status of the DBG field in
Section 19.3.2.1, “eQADC Module Configuration Register (EQADC_MCR)
0b00, the debug mode entry request is ignored. If DBG is programmed to 0b10 or to 0b11, the eQADC
will enter debug mode. In case the eQADC SSI is enabled, the free running clock (FCK) output to external
device will not stop when DBG is programmed to 0b11, but FCK will stop in low phase, when DBG is
programmed to 0b10.
During debug mode, the eQADC will not transfer commands from any CFIFOs, no null messages will be
transmitted to the external device, no data will be returned to any RFIFO, no hardware trigger event will
be captured, and all eQADC registers can be accessed as in normal mode. Access to eQADC registers
implies that CFIFOs can still be triggered using software triggers, because no scheme is implemented to
1. VREF=VRH-VRL.
Summary of Contents for MPC5553
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