MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 479

• Manufacturer Part Number: MMC2114
• Description: M CORE Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA
The pause feature can be used to divide queue 1 and/or queue 2 into
multiple subqueues. A subqueue is defined by setting the pause bit in
the last CCW of the subqueue.
Figure 19-22
create subqueues. Queue 1 is shown with four CCWs in each subqueue
and queue 2 has two CCWs in each subqueue.
The operating mode selected for queue 1 determines what type of
trigger event causes the execution of each of the subqueues within
queue 1. Similarly, the operating mode for queue 2 determines the type
of trigger event required to execute each of the subqueues within
queue 2.
For example, when the external trigger rising edge continuous-scan
mode is selected for queue 1, and there are six subqueues within
queue 1, a separate rising edge is required on the external trigger pin
after every pause to begin the execution of each subqueue (refer to
Figure
The choice of single-scan or continuous-scan applies to the full queue,
and is not applied to each subqueue. Once a subqueue is initiated, each
CCW is executed sequentially until the last CCW in the subqueue is
executed and the pause state is entered. Execution can only continue
with the next CCW, which is the beginning of the next subqueue. A
subqueue cannot be executed a second time before the overall queue
execution has been completed.
•
•
•
Freescale Semiconductor, Inc.
For More Information On This Product,
Queued Analog-to-Digital Converter (QADC)
When queue 2 is active and a trigger event occurs for queue 1, the
current queue 2 conversion is aborted. The status register reports
the queue 2 status as suspended. Any trigger events occurring for
queue 2 while it is suspended are flagged as trigger overruns.
Once queue 1 reaches the completion or the paused state, queue
2 begins executing again. The programming of the RESUME bit in
QACR2 determines which CCW is executed in queue 2.
When simultaneous trigger events occur for queue 1 and queue 2,
queue 1 begins execution and the queue 2 status is changed to
trigger pending.
When subqueues are paused
19-22).
Go to: www.freescale.com
shows the CCW format and an example of using pause to
Queued Analog-to-Digital Converter (QADC)
Advance Information
Digital Control
479