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AT90S8535 Datasheet(PDF) 71 Page - ATMEL Corporation

Part No. AT90S8535
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
Download  127 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90S8535 Datasheet(HTML) 71 Page - ATMEL Corporation

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71
AT90S/LS8535
1041H–11/01
Figure 48. ADC Timing Diagram, Single Conversion
Figure 49. ADC Timing Diagram, Free Running Conversion
ADC Noise Canceler
Function
The ADC features a noise canceler that enables conversion during Idle Mode to reduce
noise induced from the CPU core. To make use of this feature, the following procedure
should be used:
1.
Make sure that the ADC is enabled and is not busy converting. Single Conver-
sion Mode must be selected and the ADC conversion complete interrupt must be
enabled.
ADEN = 1
ADSC = 0
ADFR = 0
ADIE = 1
Table 26. ADC Conversion Time
Condition
Sample and Hold (Cycles
from Start of Conversion)
Conversion
Time (Cycles)
Conversion
Time (µs)
Extended Conversion
14
25
125 - 500
Normal Conversion
14
26
130 - 520
1
2
3
4
5
6
7
8
9
10
11
12
13
Sign and MSB of result
LSB of result
ADC clock
ADSC
ADIF
ADCH
ADCL
Cycle number
12
One Conversion
Next Conversion
3
Sample & hold
MUX and REFS
update
Conversion
complete
MUX and REFS
update
11
12
13
Sign and MSB of result
LSB of result
ADC clock
ADSC
ADIF
ADCH
ADCL
Cycle number
12
One Conversion
Next Conversion
34
Conversion
complete
Sample & hold
MUX and REFS
update


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