Rainbow-electronics ATmega64M1 Manuel d'utilisateur télécharger pdf (Page 259)

259

8209A–AVR–08/09

ATmega16M1/32M1/64M1

24.4.2 AC1CON – Analog Comparator 1Control Register

• Bit 7– AC1EN: Analog Comparator 1 Enable Bit

Set this bit to enable the analog comparator 1.

Clear this bit to disable the analog comparator 1.

• Bit 6– AC1IE: Analog Comparator 1 Interrupt Enable bit

Set this bit to enable the analog comparator 1 interrupt.

Clear this bit to disable the analog comparator 1 interrupt.

• Bit 5:4– AC1IS[1:0]: Analog Comparator 1 Interrupt Select bit

These 2 bits determine the sensitivity of the interrupt trigger.

The different setting are shown in Table 24-1.

• Bit 3– AC1ICE: Analog Comparator 1 Interrupt Capture Enable bit

Set this bit to enable the input capture of the Timer/Counter1 on the analog comparator event.

The comparator output is in this case directly connected to the input capture front-end logic,

making the comparator utilize the noise canceler and edge select features of the

Timer/Counter1 Input Capture interrupt. To make the comparator trigger the Timer/Counter1

Input Capture interrupt, the ICIE1 bit in the Timer Interrupt Mask Register (TIMSK1) must be set.

Table 24-2. Analog Comparator 0 negative input selection

AC0M[2:0] Description

000 “Vref”/6.40

001 “Vref”/3.20

010 “Vref”/2.13

000 “Vref”/1.60

111 Bandgap (1.1V)

101 DAC result

110 Analog Comparator Negative Input (ACMPM pin)

111 Reserved

Bit 76543210

AC1EN AC1IE AC1IS1 AC1IS0 AC1ICE AC1M2 AC1M1 AC1M0 AC1CON

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 24-3. Interrupt sensitivity selection

AC1IS[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

1 2 ... 254 255 256 257 258 259 260 261 262 263 264 ... 342 343

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Rainbow-electronics ATmega64M1 Manuel d'utilisateur Page 259