Rainbow-electronics ATmega64C1 Instrukcja Użytkownika Pobierz pdf (Strona 262)

262

7647A–AVR–02/08

ATmega32/64/M1/C1

These 3 bits determine the input of the negative input of the analog comparator.

The different setting are shown in Table 20-4.

20.4.3 Analog Comparator 2 Control Register – AC2CON

• Bit 7– AC2EN: Analog Comparator 2 Enable Bit

Set this bit to enable the analog comparator 2.

Clear this bit to disable the analog comparator 2.

• Bit 6– AC2IE: Analog Comparator 2 Interrupt Enable bit

Set this bit to enable the analog comparator 2 interrupt.

Clear this bit to disable the analog comparator 2 interrupt.

• Bit 5, 4– AC2IS1, AC2IS0: Analog Comparator 2 Interrupt Select bit

These 2 bits determine the sensitivity of the interrupt trigger.

The different setting are shown in Table 20-1.

• Bit 3 – Res: Reserved Bit

This bit is an unused bit in the ATmega32/64/M1/C1, and will always read as zero.

• Bit 2, 1, 0– AC2M2, AC2M1, AC2M0: Analog Comparator 2 Multiplexer register

Table 20-4. Analog Comparator 1 negative input selection

AC1M2 AC1M1 AC1M0 Description

000“Vref”/6.40

001“Vref”/3.20

010“Vref”/2.13

011“Vref”/1.60

100Bandgap (1.1V)

101DAC result

110Analog Comparator Negative Input (ACMPM pin)

111Reserved

Bit 76543210

AC2EN AC2IE AC2IS1 AC2IS0 - AC2M2 AC2M1 AC2M0 AC2CON

Read/Write 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 20-5. Interrupt sensitivity selection

AC2IS1 AC2IS0 Description

0 0 Comparator Interrupt on output toggle

01Reserved

1 0 Comparator interrupt on output falling edge

1 1 Comparator interrupt on output rising edge

1 2 ... 257 258 259 260 261 262 263 264 265 266 267 ... 365 366

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Rainbow-electronics ATmega64C1 Instrukcja Użytkownika Strona 262