Rainbow-electronics ATmega64C1 Manuel d'utilisateur télécharger pdf (Page 254)

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7647A–AVR–02/08

ATmega32/64/M1/C1

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 adapted to the amplifier clock and AMP2TS2,AMP2TS1, AMP2TS0 bits

have no effect.

Clear this bit to normally use the Amplifier 2.

• Bit 2:0 – AMP2TS2,AMP2TS1, AMP2TS0: Amplifier 2 Clock Source Selection Bits

In accordance with the Table 18-13, 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.

01Gain 10

10Gain 20

11Gain 40

Table 18-13. AMP1 Clock Source Selection

AMP2TS2 AMP2TS1 AMP2TS0 Clock Source

0 0 0 ADC Clock/8

0 0 1 Timer/Counter0 Compare Match

0 1 0 Timer/Counter0 Overflow

0 1 1 Timer/Counter1 Compare Match B

1 0 0 Timer/Counter1 Overflow

1 0 1 PSC Module 0 Synchronization Signal (PSS0)

1 1 0 PSC Module 1 Synchronization Signal (PSS1)

1 1 1 PSC Module 2 Synchronization Signal (PSS2)

Table 18-12. Amplifier 2 Gain Selection

AMP2G1 AMP2G0 Description

1 2 ... 249 250 251 252 253 254 255 256 257 258 259 ... 365 366

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Rainbow-electronics ATmega64C1 Manuel d'utilisateur Page 254

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