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)字轉換器參考手冊
文件頁數(shù): 94/122頁
文件大?。?/td> 940K
代理商: QADCRM
MOTOROLA
9-8
QUEUE PRIORITY EXAMPLES
QADC
REFERENCE MANUAL
When freeze occurs between the conversion of two simultaneous samples, the sec-
ond value is not a valid result. When the software is correlating successive samples
from one scan in any other way, the freeze condition can disrupt measurements. For
example, when the software is averaging multiple samples of one channel to produce
a more accurate conversion result, if freeze were to occur before the consecutive con-
versions are complete, the average value would span the breakpoint interval.
Trigger events that occur during freeze are not recorded. When a trigger event is pend-
ing for queue 2 before freeze begins, that trigger event is remembered when the freeze
is passed. Similarly, when freeze occurs while queue 2 is suspended, after freeze,
queue 2 resumes execution as soon as queue 1 is finished.
Situations 12 through 19 (
Figure 9-12
to
Figure 9-19
) show examples of all of the
freeze situations.
Figure 9-12 CCW Freeze Situation 12
Figure 9-13 CCW Freeze Situation 13
Figure 9-14 CCW Freeze Situation 14
QADC S12
C3
C4
CF1
C1
C2
T1
Q1:
FREEZE
QADC S13
C1
C2
T2
Q2:
CF2
C3
C4
FREEZE
QADC S14
C1
C2
T1
Q1:
CF1
C3
C4
FREEZE
T1
T1
T2
T2
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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