Rainbow-electronics ATmega64C1 Manual de usuario descargar pdf (Pagina 260)

260

7647A–AVR–02/08

ATmega32/64/M1/C1

20.4 Analog Comparator Register Description

Each analog comparator has its own control register.

A dedicated register has been designed to consign the outputs and the flags of the 4 analog

comparators.

20.4.1 Analog Comparator 0 Control Register – AC0CON

• Bit 7– AC0EN: Analog Comparator 0 Enable Bit

Set this bit to enable the analog comparator 0.

Clear this bit to disable the analog comparator 0.

• Bit 6– AC0IE: Analog Comparator 0 Interrupt Enable bit

Set this bit to enable the analog comparator 0 interrupt.

Clear this bit to disable the analog comparator 0 interrupt.

• Bit 5, 4– AC0IS1, AC0IS0: Analog Comparator 0 Interrupt Select bit

These 2 bits determine the sensitivity of the interrupt trigger.

The different setting are shown in Table 20-1.

• Bit 3 – ACCKSEL: Analog Comparator Clock Select

Set this bit to use the PLL output as comparator clock.

Clear this bit to use the CLK

as comparator clock.

• Bit 2, 1, 0– AC0M2, AC0M1, AC0M0: Analog Comparator 0 Multiplexer register

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

The different setting are shown in Table 20-2.

Bit 76543210

AC0EN AC0IE AC0IS1 AC0IS0 ACCKSEL AC0M2 AC0M1 AC0M0 AC0CON

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 20-1. Interrupt sensitivity selection

AC0IS1 AC0IS0 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

Table 20-2. Analog Comparator 0 negative input selection

AC0M2 AC0M1 AC0M0 Description

000“Vref”/6.40

001“Vref”/3.20

010“Vref”/2.13

011“Vref”/1.60

100Bandgap (1.1V)

1 2 ... 255 256 257 258 259 260 261 262 263 264 265 ... 365 366

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Rainbow-electronics ATmega64C1 Manual de usuario Pagina 260