Rainbow-electronics ATmega64C1 Manuel d'utilisateur télécharger pdf (Page 253)

253

7647A–AVR–02/08

ATmega32/64/M1/C1

Set this bit to connect the amplifier 1 to the comparator 1 positive input. In this configuration the

comparator clock is adapted to the amplifier clock and AMP1TS2,AMP1TS1, AMP1TS0 bits

have no effect.

Clear this bit to normally use the Amplifier 1.

• Bit 2:0 – AMP1TS2,AMP1TS1, AMP1TS0: Amplifier 1 Clock Source Selection Bits

In accordance with the Table 18-11, 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.

18.11.3 Amplifier 2 Control and Status register – AMP2CSR

• 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 18-11. AMP1 Clock Source Selection

AMP1TS2 AMP1TS1 AMP1TS0 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)

Bit 76543210

AMP2EN AMP2IS AMP2G1 AMP2G0 AMPCMP2 AMP2TS2 AMP2TS1 AMP2TS0 AMP2CSR

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 18-12. Amplifier 2 Gain Selection

AMP2G1 AMP2G0 Description

00Gain 5

1 2 ... 248 249 250 251 252 253 254 255 256 257 258 ... 365 366

Pas de commentaire

Rainbow-electronics ATmega64C1 Manuel d'utilisateur Page 253