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): 48/122頁
文件大小: 940K
代理商: QADCRM
MOTOROLA
7-2
DIGITAL CONTROL
QADC
REFERENCE MANUAL
Figure 7-1
shows the CCW format and an example of using pause to create sub-
queues. Queue 1 is shown with four CCWs in each subqueue and queue 2 has two
CCWs in each subqueue.
Figure 7-1 QADC Queue Operation With Pause
The queue 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 queue
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 re-
quired on the external trigger pin after every pause to begin the execution of each sub-
queue (refer to
Figure 7-1
). Refer to
7.3 Scan Modes
for more information on different
scan modes.
The choice of single-scan or continuous-scan applies to the full queue, and is not ap-
plied to each subqueue. Once a subqueue is initiated, each CCW is executed sequen-
tially until the last CCW in the subqueue is executed and the pause state is entered.
QADC CQP
00
BEGIN QUEUE 1
BQ2
39
END OF QUEUE 1
BEGIN QUEUE 2
END OF QUEUE 2
00
39
CHANNEL SELECT,
SAMPLE, HOLD, AND
A/D CONVERSION
CONVERSION COMMAND WORD
(CCW) TABLE
P
RESULT WORD TABLE
0
0
0
1
0
0
0
1
0
0
0
0
1
0
1
0
1
0
P
1
P
0
PAUSE
PAUSE
PAUSE
PAUSE
PAUSE
PAUSE
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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