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參數(shù)資料
| 型號： | ADCRM |
| 英文描述： | Analog-to-Digital Reference Manual |
| 中文描述： | 模擬到數(shù)字參考手冊 |
| 文件頁數(shù)： | 30/46頁 |
| 文件大?。?/td> | 415K |
| 代理商： | ADCRM |
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MOTOROLA
5-10
DIGITAL CONTROL SUBSYSTEM
ADC
REFERENCE MANUAL
The conversion result is unsigned right-justified data. Bits [9:0] are used for 10-bit res-
olution, bits [7:0] are used for 8-bit resolution (bits [9:8] are zero). Bits [15:10] always
return zero when read.
The conversion result is signed left-justified data. Bits [15:6] are used for 10-bit reso-
lution, bits [15:8] are used for 8-bit resolution (bits [7:6] are zero).
Although the ADC is a unipolar converter, this data format is provided by assuming
that the zero reference point is (V
RH
+
V
RL
)
/
2. When the register is read, bit 15 re-
turns zero for a positive number and one for a negative number. For a negative num-
ber, the value read is in twos complement form. Bits [5:0] return zeros when read. For
eight-bit conversions, the table below summarizes the results of a read of the upper
byte of this register.
The conversion result is unsigned left-justified data. Bits [15:6] are used for 10-bit res-
olution, bits [15:8] are used for 8-bit resolution (bits [7:6] are zero). Bits [5:0] always
return zero when read.
Unsigned Right-Justified Format
$XXXX10–$XXXX1F
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Not Used
10-Bit Result
8/10-Bit Result
Signed Left-Justified Format
$XXXX20–$XXXX2F
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
8/10-Bit Result
10-Bit Result
Not Used
Input Voltage
+ Full scale (V
RH
)
Bipolar zero ((V
RH
- V
RH
)/2)
Zero - 1 count
– Full scale (V
RL
)
Digital Result
$7F
$00
$FF
$80
Unsigned Left-Justified Format
$XXXX30–$XXXX3F
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
8/10-Bit Result
10-Bit Result
Not Used
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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