Table 18-11. AMP1 Clock Source Selection
AMP1TS2
AMP1TS1
AMP1TS0
Clock Source
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
ADC clock/8
Timer/Counter0 compare match
Timer/Counter0 overflow
Timer/Counter1 compare match B
Timer/Counter1 overflow
PSC module 0 synchronization signal (PSS0)
PSC module 1 synchronization signal (PSS1)
PSC module 2 synchronization signal (PSS2)
18.11.3 Amplifier 2 Control and Status Register – AMP2CSR
Bit
7
6
5
4
3
2
1
0
AMP2EN AMP2IS AMP2G1 AMP2G0 AMPCMP2 AMP2TS2 AMP2TS1 AMP2TS0 AMP2CSR
Read/Write
Initial Value
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
• Bit 7 – AMP2EN: Amplifier 2 Enable Bit
Set this bit to enable the Amplifier 2.
Clear this bit to disable the Amplifier 2.
Clearing this bit while a conversion is running will take effect at the end of the conversion.
Warning: Always clear AMP2TS0:1 when clearing AMP2EN.
• Bit 6 – AMP2IS: Amplifier 2 Input Shunt
Set this bit to short-circuit the Amplifier 2 input.
Clear this bit to normally use the Amplifier 2.
• Bit 5, 4 – AMP2G1, 0: Amplifier 2 Gain Selection Bits
These 2 bits determine the gain of the amplifier 2.
The different setting are shown in Table 18-12.
Table 18-12. Amplifier 2 Gain Selection
AMP2G1
AMP2G0
Description
Gain 5
0
0
1
1
0
1
0
1
Gain 10
Gain 20
Gain 40
To ensure an accurate result, after the gain value has been changed, the amplifier input needs to have a quite stable input
value during at least 4 Amplifier synchronization clock periods.
• Bit 3 – AMPCMP2: Amplifier 2 - Comparator 2 connection
Set this bit to connect the amplifier 2 to the comparator 2 positive input. In this configuration the comparator clock is twice the
amplifier clock. Clear this bit to normally use the Amplifier 2.
• Bit 2:0 – AMP2TS2,AMP2TS1, AMP2TS0: Amplifier 2 Clock Source Selection Bits
In accordance with Table 18-13 on page 221, these 3 bits select the event which will generate the clock for the amplifier 1.
This clock source is necessary to start the conversion on the amplified channel.
220
ATmega16/32/64/M1/C1 [DATASHEET]
7647O–AVR–01/15
MICROCHIP [ MICROCHIP ]
