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參數(shù)資料
| 型號： | QADCRM |
| 英文描述： | Queued Analog-to-Digital Converter Reference Manual |
| 中文描述： | 排隊模擬到數(shù)字轉(zhuǎn)換器參考手冊 |
| 文件頁數(shù)： | 53/122頁 |
| 文件大?。?/td> | 940K |
| 代理商： | QADCRM |
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QADC
REFERENCE MANUAL
DIGITAL CONTROL
MOTOROLA
7-7
The interval timer generates a trigger event whenever the time interval elapses. The
trigger event may cause the queue execution to continue following a pause, or may be
considered a trigger overrun. Once the queue execution is completed, the single-scan
enable bit must be set again to enable the timer to count again.
The interval timer single-scan mode can be used in applications which need coherent
results, for example:
When it is necessary that all samples are guaranteed to be taken during the same
scan of the analog pins.
When the interrupt rate in the periodic timer continuous-scan mode would be too
high.
In sensitive battery applications, where the single-scan mode uses less power
than the software initiated continuous-scan mode.
7.3.3 Continuous-Scan Modes
When the application software wants to execute multiple passes through a sequence
of conversions defined by a queue, a continuous-scan queue operating mode is se-
lected. By programming the MQ1 field in QACR1, the following software initiated
modes can be selected for queue 1:
Software initiated continuous-scan mode
External trigger rising edge continuous-scan mode
External trigger falling edge continuous-scan mode
In addition to the above modes, queue 2 can also be programmed for the periodic tim-
er continuous-scan mode, where a scan is initiated at a selectable time interval using
the on-chip periodic/interval timer. The queue operating mode for queue 2 is selected
by the MQ2 field in QACR2.
When a queue is programmed for a continuous-scan mode, the single-scan enable bit
in the queue control register does not have any meaning or effect. As soon as the
queue operating mode is programmed, the selected trigger event can initiate queue
execution.
In the case of the software initiated continuous-scan mode, the trigger event is gener-
ated internally and queue execution begins immediately. In the other single-scan
queue operating modes, the selected trigger event must occur before the queue can
start. A trigger overrun is recorded if a trigger event occurs during queue execution in
the external trigger continuous-scan mode and the periodic timer continuous-scan
mode. When a pause bit is encountered during the scan, another trigger event is re-
quired for queue execution to continue. Software involvement is not needed to enable
queue execution to continue from the paused state.
In the software initiated continuous-scan mode, the trigger event is generated internal-
ly as soon as the conversion is complete for the CCW with the pause bit set. The pause
is two QCLKs. In the external trigger continuous-scan mode, the queue remains
paused until another trigger edge is received on the external trigger pin. In the periodic
timer continuous-scan mode, the next expiration of the timer is the trigger event for the
queue.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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