at90ls8535-8mi ATMEL Corporation, at90ls8535-8mi Datasheet - Page 71

• Manufacturer Part Number: at90ls8535-8mi
• Description: 8-bit Microcontroller With 8k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

ADC Noise Canceler
Function
1041H–11/01
Figure 48. ADC Timing Diagram, Single Conversion
Figure 49. ADC Timing Diagram, Free Running Conversion
Table 26. ADC Conversion Time
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-
Cycle number
ADC clock
ADSC
ADIF
ADCH
ADCL
Condition
Extended Conversion
Normal Conversion
sion Mode must be selected and the ADC conversion complete interrupt must be
enabled.
ADEN = 1
ADSC = 0
ADFR = 0
ADIE = 1
1
Cycle number
ADC clock
ADSC
ADIF
ADCH
ADCL
2
MUX and REFS
update
3
from Start of Conversion)
Conversion
Sample and Hold (Cycles
complete
Sample & hold
One Conversion
4
11
5
12
14
14
6
7
13
One Conversion
8
Next Conversion
1
Sign and MSB of result
LSB of result
9
2
MUX and REFS
update
10
Conversion
25
26
complete
Time (Cycles)
Conversion
3
11
AT90S/LS8535
Sample & hold
12
4
13
Sign and MSB of result
125 - 500
130 - 520
LSB of result
Next Conversion
1
Conversion
Time (µs)
2
MUX and REFS
update
3
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