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8209A–AVR–08/09

ATmega16M1/32M1/64M1

22.10.9 AMP1CSR – Amplifier 1 Control and Status register

• Bit 7 – AMP1EN: Amplifier 1 Enable Bit

Set this bit to enable the Amplifier 1.

Clear this bit to disable the Amplifier 1.

Clearing this bit while a conversion is running will take effect at the end of the conversion.

Warning: Always clear AMP1TS0:1 when clearing AMP1EN.

• 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 – AMP1G[1:0]: Amplifier 1 Gain Selection Bits

These 2 bits determine the gain of the amplifier 1.

The different setting are shown in Table 22-10.

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.

Table 22-9. AMP0 Clock Source Selection

AMP0TS[2:0] Clock Source

000 ADC Clock/8

001 Timer/Counter0 Compare Match

010 Timer/Counter0 Overflow

011 Timer/Counter1 Compare Match B

100 Timer/Counter1 Overflow

101 PSC Module 0 Synchronization Signal (PSS0)

110 PSC Module 1 Synchronization Signal (PSS1)

111 PSC Module 2 Synchronization Signal (PSS2)

Bit 76543210

AMP1EN AMP1IS AMP1G1 AMP1G0 AMPCMP1 AMP1TS2 AMP1TS1 AMP1TS0 AMP1CSR

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

Initial Value 0 0 0 0 0 0 0 0

Table 22-10. Amplifier 1 Gain Selection

AMP1G[1:0] Description

00 Gain 5

01 Gain 10

10 Gain 20

11 Gain 40

1 2 ... 245 246 247 248 249 250 251 252 253 254 255 ... 342 343

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