Enhanced Queued Analog-to-Digital Converter (eQADC)MPC5566 Microcontroller Reference Manual, Rev. 219-110 Freescale Semiconductor9. When all of the configuration commands are transferred, EQADC_FISRn[CF0] is set. Refer toSection 19.3.2.8, “eQADC FIFO and Interrupt Status Registers 0–5 (EQADC_FISRn).” TheeQADC generates an end of queue interrupt. The initialization procedure is complete.Figure 19-64. Example of a Command Queue Configuring the On-Chip ADCs/External Device19.5.1.2 Configuring eQADC for ApplicationsThis section provides an example based on the applications in Table 19-56. The example describes how toconfigure multiple command queues to be used for those applications and provides a step-by-stepprocedure to configure the eQADC and the associated command queue structures. In the example, the“Fast hardware-triggered command queue,” described on the second row of Table 19-56, transfer itscommands to ADC1; the conversion commands are executed by ADC1. The generated results are returnedto RFIFO3 before being transferred to the result queues in the RAM by the eDMA.NOTEThere is no fixed relationship between CFIFOs and RFIFOs with the samenumber. The results of commands being transferred through CFIFO1 can bereturned to any RFIFO, regardless of its number. The destination of a resultis determined by the MESSAGE_TAG field of the command that requestedthe result. Refer to Section 19.4.1.2, “Message Format in eQADC,” fordetails.Step One: Set up the command queues and result queues.1. Load the RAM with configuration and conversion commands. Table 19-57 is an example of howto set commands for command queue 1 .a) Each trigger event causes four commands to be executed. When the eQADC detects the pausebit asserted, it waits for another trigger to restart transferring commands from the CFIFO.b) At the end of the command queue, the “EOQ” bit is asserted as shown in Table 19-57.c) Results are returned to RFIFO3 as specified in the MESSAGE_TAG field of commands.2. Reserve memory space for storing results.Configuration Command to ADC0—Ex: Write ADC0_CRCommand Queue in0x00x10x20x3System MemoryConfiguration Command to ADC2—Ex: Write to external device configuration registerConfiguration Command to ADC0—Ex: Write ADC_TSCRConfiguration Command to ADC1—Ex: Write ADC1_CRCommandAddress
