Rainbow-electronics ATmega64M1 Uživatelský manuál stáhnout pdf (Strana 262)

262

8209A–AVR–08/09

ATmega16M1/32M1/64M1

• Bit 3 – Res: Reserved

This bit isreserved and will always read as zero.

• Bit 2:0– AC3M[2:0]: Analog Comparator 3 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.

24.4.5 ACSR – Analog Comparator Status Register

• Bit 7 – AC3IF: Analog Comparator 3 Interrupt Flag Bit

This bit is set by hardware when comparator 3 output event triggers off the interrupt mode

defined by AC3IS1 and AC3IS0 bits in AC2CON register.

This bit is cleared by hardware when the corresponding interrupt vector is executed in case the

AC3IE in AC3CON register is set. Anyway, this bit is cleared by writing a logical one on it.

This bit can also be used to synchronize ADC or DAC conversions.

• Bit 6 – AC2IF: Analog Comparator 2 Interrupt Flag Bit

This bit is set by hardware when comparator 2 output event triggers off the interrupt mode

defined by AC2IS1 and AC2IS0 bits in AC2CON register.

This bit is cleared by hardware when the corresponding interrupt vector is executed in case the

Table 24-7. Interrupt sensitivity selection

AC3IS[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 24-8. Analog Comparator 3 negative input selection

AC3M[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

AC3IF AC2IF AC1IF AC0IF AC3O AC2O AC1O AC0O ACSR

Read/Write R/W R/W R/W R/W R R R R

Initial Value 0 0 0 0 0 0 0 0

1 2 ... 257 258 259 260 261 262 263 264 265 266 267 ... 342 343

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Rainbow-electronics ATmega64M1 Uživatelský manuál Strana 262