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): 89/122頁
文件大小: 940K
代理商: QADCRM
QADC
REFERENCE MANUAL
QUEUE PRIORITY EXAMPLES
MOTOROLA
9-3
In situation S2 (
Figure 9-2
), more than one trigger event is recognized before servicing
of a previous trigger event is complete, the trigger overrun bit is again set, but other-
wise, the additional trigger events are ignored. After the queue is complete, the first
newly detected trigger event causes queue execution to begin again. When the trigger
event rate is high, a new trigger event can be seen very soon after completion of the
previous queue, leaving software little time to retrieve the previous results. Also, when
trigger events are occurring at a high rate for queue 1, the lower priority queue 2 chan-
nels may not get serviced at all.
Figure 9-2 CCW Priority Situation 2
Figure 9-3
shows that when the pause feature is in use, the trigger overrun error sta-
tus bit is set the same way, and that queue execution continues unchanged.
Figure 9-3 CCW Priority Situation 3
QADC S2
ACTIVE
IDLE
Q1
Q2
QS
IDLE
ACTIVE
IDLE
ACTIVE
IDLE
1000
1000
0000
0010
0000
C1
C2
C3
C4
TOR2
T2
T2
Q2:
CF2
IDLE
C1
C2
C3
C4
T1
CF1
C1
C2
C3
C4
TOR1
T1
T1
Q1:
CF1
TOR1
T1
TOR1
T1
TOR2
T2
QADC S3
PAUSE
Q1
Q2
QS
IDLE
ACTIVE
IDLE
ACTIVE
IDLE
1000
0110
0001
0010
ACTIVE
0000
IDLE
C1
C2
T1
T1
Q1:
TOR1
PF1
C1
C2
0000
Q2:
0100
TOR2
PF2
T2
T2
0101
C3
C4
T1
T1
TOR1
CF1
ACTIVE
PAUSE
1001
C3
C4
CF2
T2
T2
TOR2
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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