ATTINY2313-20MU datasheet(77/231 Pages) ATMEL

Teilenummer	ATTINY2313-20MU

Bauteilbeschribung	8-bit Microcontroller with 2K Bytes In-System Programmable Flash

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Hersteller	ATMEL [ATMEL Corporation]

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ATtiny2313/V

2543I–AVR–04/06

8-bit Timer/Counter

Register Description

Timer/Counter Control

Register A – TCCR0A

• Bits 7:6 – COM0A1:0: Compare Match Output A Mode

These bits control the Output Compare pin (OC0A) behavior. If one or both of the

COM0A1:0 bits are set, the OC0A output overrides the normal port functionality of the

I/O pin it is connected to. However, note that the Data Direction Register (DDR) bit cor-

responding to the OC0A pin must be set in order to enable the output driver.

When OC0A is connected to the pin, the function of the COM0A1:0 bits depends on the

WGM02:0 bit setting. Table 34 shows the COM0A1:0 bit functionality when the

WGM02:0 bits are set to a normal or CTC mode (non-PWM).

Table 35 shows the COM0A1:0 bit functionality when the WGM01:0 bits are set to fast

PWM mode.

Note:

1. A special case occurs when OCR0A equals TOP and COM0A1 is set. In this case,

the Compare Match is ignored, but the set or clear is done at TOP. See “Fast PWM

Mode” on page 72 for more details.

Bit

7

6

5

4

3

2

1

0

COM0A1

COM0A0

COM0B1

COM0B0

–

WGM01

WGM00

TCCR0A

Read/Write

R/W

R

R/W

Initial Value

0

Table 34. Compare Output Mode, non-PWM Mode

COM0A1

COM0A0

Description

0

Normal port operation, OC0A disconnected.

0

1

Toggle OC0A on Compare Match

1

0

Clear OC0A on Compare Match

1

Set OC0A on Compare Match

Table 35. Compare Output Mode, Fast PWM Mode

(1)

COM0A1

COM0A0

Description

0

Normal port operation, OC0A disconnected.

0

1

WGM02 = 0: Normal Port Operation, OC0A Disconnected.

WGM02 = 1: Toggle OC0A on Compare Match.

1

0

Clear OC0A on Compare Match, set OC0A at TOP

1

Set OC0A on Compare Match, clear OC0A at TOP

Ähnliche Beschreibung - ATTINY2313-20MU

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