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(duì)模擬到數(shù)字轉(zhuǎn)換器參考手冊
文件頁數(shù): 73/122頁
文件大?。?/td> 940K
代理商: QADCRM
QADC
REFERENCE MANUAL
DIGITAL CONTROL
MOTOROLA
7-27
is completed for a CCW entry, the 10-bit result is written in the corresponding result
word entry. The QADC provides 40 CCW table entries. If more results are needed,
software uses one or more result table locations for multiple channels.
The beginning of queue 1 is the first location in the CCW table. The first location of
queue 2 is specified by the beginning of queue 2 pointer (BQ2) in QACR2. To dedicate
the entire CCW table to queue 1, queue 2 is programmed to be in the disabled mode,
and the beginning of BQ2 is programmed to any value greater than 39. To dedicate
the entire CCW table to queue 2, queue 1 is programmed to be in the disabled mode,
and BQ2 is specified as the first location in the CCW table.
Figure 7-5
illustrates the operation of the queue structure.
Figure 7-5 QADC Conversion Queue Operation
QADC CQ
00
BEGIN QUEUE 1
BQ2
39
END OF QUEUE 1
BEGIN QUEUE 2
END OF QUEUE 2
P
IST
CHAN
9
7
8
6
4
3
2
1
5
0
P = PAUSE UNTIL NEXT TRIGGER
BYP = BYPASS
IST = INPUT SAMPLE TIME
CHAN = CHANNEL NUMBER AND END-OF-QUEUE CODE
10-BIT CONVERSION COMMAND
WORD FORMAT
00
39
RESULT
7
8
6
4 3
2
1
5
9
0
8
0
10
0
11
0
12
0
13
0
14
0
15
0
RESULT
9
7
8
4 3
0
2
0
1
0
5
0
0
0
8
10
11
12
13
14
6
15
S
RESULT
9
7
8
4 3
0
2
0
1
0
5
0
0
0
8
10
11
12
13
14
6
15
0
0
RIGHT JUSTIFIED, UNSIGNED RESULT
LEFT JUSTIFIED, UNSIGNED RESULT
LEFT JUSTIFIED, SIGNED RESULT
10-BIT RESULT, READABLE IN
THREE 16-BIT FORMATS
S = SIGN BIT
CHANNEL SELECT,
SAMPLE, HOLD, AND
A/D CONVERSION
CONVERSION COMMAND WORD
(CCW) TABLE
RESULT WORD TABLE
BYP
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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