Rainbow-electronics Atmega169L Manuel d'utilisateur télécharger pdf (Page 208)

208

ATmega169V/L

2514A–AVR–08/02

• ADC9:0: ADC Conversion Result

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

Result” on page 203.

ADC Control and Status

• Bit 7 – ADHSM: ADC High Speed Mode

Writing this bit to one enables the ADC High Speed mode. This mode enables higher

conversion rate at the expense of higher power consumption.

• Bit 2:0 – 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

Digital Input Disable Register

1 – DIDR1

• Bit 7..0 – ADC7D..ADC0D: ADC7..0 Digital Input Disable

When this bit is written logic one, the digital input buffer on the corresponding ADC pin is

disabled. The corresponding PIN Register bit will always read as zero when this bit is

set. When an analog signal is applied to the ADC7..0 pin and the digital input from this

pin is not needed, this bit should be written logic one to reduce power consumption in

the digital input buffer.

Bit 7 6543210

ADHSM

ACME – – – ADTS2 ADTS1 ADTS0 ADCSRB

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

InitialValue00000000

Table 92. 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

Bit 76543210

ADC7D ADC6D ADC5D ADC4D ADC3D ADC2D ADC1D ADC0D DIDR1

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

InitialValue00000000

1 2 ... 203 204 205 206 207 208 209 210 211 212 213 ... 316 317

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Rainbow-electronics Atmega169L Manuel d'utilisateur Page 208

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