AT90LS4433-4AI datasheet(67/126 Pages) ATMEL

67 / 126 page

AT90S/LS4433

1042H–AVR–04/03

Figure 47. ADC Timing Diagram, Single Conversion

Figure 48. ADC Timing Diagram, Free Run 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:

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. Thus:

ADEN = 1

ADSC = 0

ADFR = 0

ADIE = 1

Enter Idle mode. The ADC will start a conversion once the CPU has been halted.

If no other interrupts occur before the ADC conversion completes, the ADC inter-

rupt will wake up the MCU and execute the ADC conversion complete interrupt

routine.

Sign and MSB of Result

LSB of Result

ADC Clock

ADSC

ADIF

ADCH

ADCL

Cycle Number

One Conversion

Next Conversion

Sample & Hold

MUX and REFS

Update

Conversion

complete

MUX and REFS

Update

MSB of Result

LSB of Result

ADC Clock

ADSC

Hold Strobe

ADIF

ADCH

ADCL

Cycle Number

One Conversion

Conversion

AT90LS4433-4AI 데이터시트(PDF) 67 Page - ATMEL Corporation

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