参数资料
型号: SAK-C509-LM
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 16 MHz, MICROCONTROLLER, PQFP100
封装: PLASTIC, MQFP-100
文件页数: 51/74页
文件大小: 1607K
代理商: SAK-C509-LM
C509-L
Semiconductor Group
54
A/D Conversion Timing
An A/D conversion is internally started by writing into the SFR ADDATL with dummy data. A write
to SFR ADDATL will start a new conversion even if a conversion is currently in progress. Basically,
the A/D conversion procedure is divided into three parts :
– Sample phase (tS), used for sampling the analog input voltage.
– Conversion phase (tCO), used for the real A/D conversion.(includes calibration)
– Write result phase (tWR), used for writing the conversion result into the ADDAT registers.
The total A/D conversion time is defined by tADCC which is the sum of the two phase times tS and
tCO. The duration of the two phases of an A/D conversion is specified by its specific timing
parameter as shown in figure 29.
Figure 29
A/D Conversion Timing
Conversion Clock
Prescaler
ADCL1
ADCL0
Sample Clock
Prescaler
ADST1 ADST0
Sample
Time
tS
Conversion
Time
tCO
ConversionTime
tADCC
Number of
CPU Cycles
0
1
0
1
8 x tIN
16 x tIN
32 x tIN
64 x tIN
40 x tIN
48 x tIN
56 x tIN
72 x tIN
104 x tIN
8
9
12
17
0
1
0
1
0
1
16 x tIN
32 x tIN
64 x tIN
128 x tIN
80 x tIN
96 x tIN
112 x tIN
144 x tIN
208 x tIN
16
18
24
34
1
0
1
0
1
32 x tIN
64 x tIN
128 x tIN
256 x tIN
160 x tIN
192 x tIN
224 x tIN
288 x tIN
416 x tIN
32
37
48
69
1
0
1
0
1
64 x tIN
128 x tIN
256 x tIN
512 x tIN
320 x tIN
384 x tIN
448 x tIN
576 x tIN
832 x tIN
64
74
96
138
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