atmega163l ATMEL Corporation, atmega163l Datasheet - Page 109

• Manufacturer Part Number: atmega163l
• Description: Atmega163 8-bit Avr Microcontroller With 16k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

ADC Noise Canceler
Function
1142E–AVR–02/03
Figure 61. ADC Timing Diagram, Free Run Conversion
Table 39. ADC Conversion Time
The ADC features a Noise Canceler that enables conversion during ADC Noise Reduc-
tion mode (see “Sleep Modes” on page 35) to reduce noise induced from the CPU core
and other I/O peripherals. If other I/O peripherals must be active during conversion, this
mode works equivalently for Idle mode. To make use of this feature, the following proce-
dure should be used:
1. Make sure that the ADC is enabled and is not busy converting. Single Conver-
2. Enter ADC Noise Reduction mode (or Idle mode). The ADC will start a conver-
3. If no other interrupts occur before the ADC conversion completes, the ADC inter-
Condition
Extended Conversion
Normal Conversions
sion Mode must be selected and the ADC conversion complete interrupt must be
enabled.
ADEN = 1
ADSC = 0
ADFR = 0
ADIE = 1
sion once the CPU has been halted.
rupt will wake up the CPU and execute the ADC Conversion Complete interrupt
routine.
Cycle Number
ADC Clock
ADSC
ADIF
ADCH
ADCL
Sample & Hold (Cycles
Conversion
Complete
from Start of
Conversion)
One Conversion
11
13.5
1.5
12
13
Next Conversion
1
Sign and MSB of Result
LSB of Result
2
Conversion Time
MUX and REFS
Update
(Cycles)
3
25
13
Sample & Hold
4
ATmega163(L)
125 - 500
65 - 260
Conversion Time
(µs)
109