Datasheet
258
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
• Bit 6– AMP1IS: Amplifier 1 Input Shunt
Set this bit to short-circuit the Amplifier 1 input.
Clear this bit to normally use the Amplifier 1.
• Bit 5, 4– AMP1G1, 0: Amplifier 1 Gain Selection Bits
These 2 bits determine the gain of the amplifier 0.
The different setting are shown in Table 21-10.
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 1, 0– AMP1TS1, AMP1TS0: Amplifier 1 Trigger Source Selection Bits
In accordance with the Table 21-11, these 2 bits select the event which will generate the trigger
for the amplifier 1. This trigger source is necessary to start the conversion on the amplified
channel.
Table 21-10. Amplifier 1 Gain Selection
AMP1G1 AMP1G0 Description
00Gain 5
01Gain 10
10Gain 20
11Gain 40
Table 21-11. AMP1 Auto Trigger source selection
AMP1TS1 AMP1TS0 Description
0 0 Auto synchronization on ADC Clock/8
0 1 Trig on PSC0ASY
1 0 Trig on PSC1ASY
1 1 Trig on PSC2ASY