Rainbow-electronics ATmega32L Manual de usuario descargar pdf (Pagina 216)

216

ATmega32(L)

2503C–AVR–10/02

• ADC9:0: ADC Conversion Result

These bits represent the result from the conversion, as detailed in “ADC Conversion

Result” on page 211.

Special FunctionIO Register –

SFIOR

• Bit 7:5 – ADTS2:0: ADC Auto Trigger Source

If ADATE in ADCSRA is written to one, the value of these bits selects which source will

trigger an ADC conversion. If ADATE is cleared, the ADTS2:0 settings will have no

effect. A conversion will be triggered by the rising edge of the selected interrupt flag.

Note that switching from a trigger source that is cleared to a trigger source that is set,

will generate a positive edge on the trigger signal. If ADEN in ADCSRA is set, this will

start a conversion. Switching to Free Running mode (ADTS[2:0]=0) will not cause a trig-

ger event, even if the ADC Interrupt Flag is set

• Bit 4 – Res: Reserved Bit

This bit is reserved for future use in the ATmega32. For ensuring compability with future

devices, this bit must be written zero when SFIOR is written.

Bit 765 4 3210

ADTS2 ADTS1 ADTS0 –

ACME PUD PSR2 PSR10 SFIOR

Read/Write R/W R/W R/W R R/W R/W R/W R/W

Initial Value 0 0 0 0 0 0 0 0

Table 86. ADC Auto Trigger Source Selections

ADTS2 ADTS1 ADTS0 Trigger Source

0 0 0 Free Running mode

0 0 1 Analog Comparator

0 1 0 External Interrupt Request 0

0 1 1 Timer/Counter0 Compare Match

1 0 0 Timer/Counter0 Overflow

1 0 1 Timer/Counter Compare Match B

1 1 0 Timer/Counter1 Overflow

1 1 1 Timer/Counter1 Capture Event

1 2 ... 211 212 213 214 215 216 217 218 219 220 221 ... 312 313

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Rainbow-electronics ATmega32L Manual de usuario Pagina 216