MMC2107 - Freescale Semiconductor

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Freescale Semiconductor, Inc. Queued Analog-to-Digital Converter (QADC) completion interrupt, or queue status are used to determine when the queue has completed. nc... Freescale Semiconductor, I After the single-scan enable bit is set, a trigger event causes the QADC to begin execution with the first CCW in the queue. The single-scan enable bit remains set until the queue is completed. After the queue reaches completion, the QADC resets the single-scan enable bit to 0. If the single-scan enable bit is written to a 1 or a 0 by the software before the queue scan is complete, the queue is not affected. However, if the software changes the queue operating mode, the new queue operating mode and the value of the single-scan enable bit are recognized immediately. The conversion in progress is aborted and the new queue operating mode takes effect. In the software-initiated single-scan mode, the writing of a 1 to the single-scan enable bit causes the QADC to generate a trigger event internally and the queue execution begins immediately. In the other single-scan queue operating modes, once the single-scan enable bit is written, the selected trigger event must occur before the queue can start. The single-scan enable bit allows the entire queue to be scanned once. A trigger overrun is captured if a trigger event occurs during queue execution in an edge-sensitive external trigger mode or a periodic/interval timer mode. In the interval timer single-scan mode, the next expiration of the timer is the trigger event for the queue. After the queue execution is complete, the queue status is shown as idle. The software can restart the queue by setting the single-scan enable bit to a 1. Queue execution begins with the first CCW in the queue. 18.10.6.1 Software-Initiated Single-Scan Mode Software can initiate the execution of a scan sequence for queues 1 or 2 by selecting the software-initiated single-scan mode, and writing the single-scan enable bit in QACR1 or QACR2. A trigger event is generated internally and the QADC immediately begins execution of the first CCW in the queue. If a pause occurs, another trigger event is generated internally, and then execution continues without pausing. The QADC automatically performs the conversions in the queue until an end-of-queue condition is encountered. The queue remains idle until the software again sets the single-scan enable bit. While the time to Technical Data MMC2107 – Rev. 2.0 468 Queued Analog-to-Digital Converter (QADC) MOTOROLA For More Information On This Product, Go to: www.freescale.com
Freescale Semiconductor, Inc. Queued Analog-to-Digital Converter (QADC) Digital Control internally generate and act on a trigger event is very short, software can momentarily read the status conditions, indicating that the queue is paused. The trigger overrun flag is never set while in the software-initiated single-scan mode. The software-initiated single-scan mode is useful in these applications: • Allows software complete control of the queue execution • Allows the software to easily alternate between several queue sequences nc... Freescale Semiconductor, I 18.10.6.2 External Trigger Single-Scan Mode The external trigger single-scan mode is available on both queue 1 and queue 2. The software programs the polarity of the external trigger edge that is to be detected, either a rising or a falling edge. The software must enable the scan to occur by setting the single-scan enable bit for the queue. The first external trigger edge causes the queue to be executed one time. Each CCW is read and the indicated conversions are performed until an end-of-queue condition is encountered. After the queue is completed, the QADC clears the single-scan enable bit. Software may set the single-scan enable bit again to allow another scan of the queue to be initiated by the next external trigger edge. The external trigger single-scan mode is useful when the input trigger rate can exceed the queue execution rate. Analog samples can be taken in sync with an external event, even though the software is not interested in data taken from every edge. The software can start the external trigger single-scan mode and get one set of data, and at a later time, start the queue again for the next set of samples. When a pause bit is encountered during external trigger single-scan mode, another trigger event is required for queue execution to continue. Software involvement is not needed to enable queue execution to continue from the paused state. MMC2107 – Rev. 2.0 Technical Data MOTOROLA Queued Analog-to-Digital Converter (QADC) 469 For More Information On This Product, Go to: www.freescale.com
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