ATMEga64L ATMEL Corporation, ATMEga64L Datasheet - Page 247

• Manufacturer Part Number: ATMEga64L
• Description: 8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

ADC Control and Status
Register B – ADCSRB
2490G–AVR–03/04
• ADC9:0: ADC Conversion Result
These bits represent the result from the conversion, as detailed in “ADC Conversion
Result” on page 242.
• Bits 7:3 – Res: Reserved Bits
These bits are reserved bits in the ATmega64 and will always read as zero.
• 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
Figure 122. ADC Auto Trigger Source Selections
Bit
Read/Write
Initial Value
ADTS2
0
0
0
0
1
1
1
1
R
7
–
0
ADTS1
R
6
–
0
0
0
1
1
0
0
1
1
R
5
–
0
ADTS0
R
4
–
0
0
1
0
1
0
1
0
1
.
R
3
–
0
Trigger Source
Free Running mode
Analog Comparator
External Interrupt Request 0
Timer/Counter0 Compare Match
Timer/Counter0 Overflow
Timer/Counter1 Compare Match B
Timer/Counter1 Overflow
Timer/Counter1 Capture Event
ADTS2
R/W
2
0
ATmega64(L)
ADTS1
R/W
1
0
ADTS0
R/W
0
0
ADCSRB
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