AT90PWM2 datasheet(256/361 Pages) ATMEL

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4317J–AVR–08/10

AT90PWM2/3/2B/3B

• Bit 7 – AMP0EN: Amplifier 0 Enable Bit

Set this bit to enable the Amplifier 0.

Clear this bit to disable the Amplifier 0.

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

Warning: Always clear AMP0TS1:0 when clearing AMP0EN.

• Bit 6– AMP0IS: Amplifier 0 Input Shunt

Set this bit to short-circuit the Amplifier 0 input.

Clear this bit to normally use the Amplifier 0.

• Bit 5, 4– AMP0G1, 0: Amplifier 0 Gain Selection Bits

These 2 bits determine the gain of the amplifier 0.

The different setting are shown in Table 21-8.

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– AMP0TS1, AMP0TS0: Amplifier 0 Trigger Source Selection Bits

In accordance with the Table 21-9, these 2 bits select the event which will generate the trigger

for the amplifier 0. This trigger source is necessary to start the conversion on the amplified

channel.

21.10.2

Amplifier 1Control and Status register – AMP1CSR

• 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 AMP1TS1:0 when clearing AMP1EN.

• Bit 6– AMP1IS: Amplifier 1 Input Shunt

Table 21-8.

Amplifier 0 Gain Selection

AMP0G1

AMP0G0

Description

Gain 5

Gain 10

Gain 20

Gain 40

Table 21-9.

AMP0 Auto Trigger Source Selection

AMP0TS1

AMP0TS0

Description

Auto synchronization on ADC Clock/8

Trig on PSC0ASY

Trig on PSC1ASY

Trig on PSC2ASY

Bit

654

AMP1EN

AMP1IS

AMP1G1

AMP1G0

AMP1TS1

AMP1TS0

AMP1CSR

Read/Write

R/W

Initial Value

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