Rainbow-electronics ATmega64M1 Manuel d'utilisateur télécharger pdf (Page 261)

261

8209A–AVR–08/09

ATmega16M1/32M1/64M1

• Bit 3 – Res: Reserved

This bit is reserved and will always read as zero.

• Bit 2:0– AC2M[2:0]: Analog Comparator 2 Multiplexer register

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

The different setting are shown in Table 24-6.

24.4.4 AC3CON – Analog Comparator 3 Control Register

• Bit 7– AC3EN: Analog Comparator 3 Enable Bit

Set this bit to enable the analog comparator 3.

Clear this bit to disable the analog comparator 3.

• Bit 6– AC3IE: Analog Comparator 3 Interrupt Enable bit

Set this bit to enable the analog comparator 3 interrupt.

Clear this bit to disable the analog comparator 3 interrupt.

• Bit 5:4– AC3IS[1:0]: Analog Comparator 3 Interrupt Select bit

These 2 bits determine the sensitivity of the interrupt trigger.

The different setting are shown in Table 24-1

Table 24-5. Interrupt sensitivity selection

AC2IS[1:0] Description

00 Comparator Interrupt on output toggle

01 Reserved

10 Comparator interrupt on output falling edge

11 Comparator interrupt on output rising edge

Table 24-6. Analog Comparator 2 negative input selection

AC2M[2:0] Description

000 “Vref”/6.40

001 “Vref”/3.20

010 “Vref”/2.13

011 “Vref”/1.60

100 Bandgap (1.1V)

101 DAC result

110 Analog Comparator Negative Input (ACMPM pin)

111 Reserved

Bit 76543210

AC3EN AC3IE AC3IS1 AC3IS0 - AC3M2 AC3M1 AC3M0 AC3CON

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

1 2 ... 256 257 258 259 260 261 262 263 264 265 266 ... 342 343

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Rainbow-electronics ATmega64M1 Manuel d'utilisateur Page 261