Rainbow-electronics AT90LS4433 Manual de usuario descargar pdf (Pagina 67)

AT90S/LS4433

1042G–AVR–09/02

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:

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. Thus:

ADEN = 1

ADSC = 0

ADFR = 0

ADIE = 1

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

3. 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.

2 3 4 5 6 7 8

10 11 12 13

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

11 12 13

MSB of Result

LSB of Result

ADC Clock

ADSC

Hold Strobe

ADIF

ADCH

ADCL

Cycle Number

One Conversion Next

Conversion

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 124 125

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Rainbow-electronics AT90LS4433 Manual de usuario Pagina 67

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