ATMEGA169PV-8MCU【PDF 33/274 页】MCU AVR 16K ISP FLASH 8MHZ 64QFN

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128

8018P–AVR–08/10

ATmega169P

15.11 16-bit Timer/Counter Register Description

15.11.1

TCCR1A – Timer/Counter1 Control Register A

Bit 7:6 – COM1A1:0: Compare Output Mode for Unit A

Bit 5:4 – COM1B1:0: Compare Output Mode for Unit B

The COM1A1:0 and COM1B1:0 control the Output Compare pins (OC1A and OC1B respec-

tively) behavior. If one or both of the COM1A1:0 bits are written to one, the OC1A output

overrides the normal port functionality of the I/O pin it is connected to. If one or both of the

COM1B1:0 bit are written to one, the OC1B output overrides the normal port functionality of the

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

ing to the OC1A or OC1B pin must be set in order to enable the output driver.

When the OC1A or OC1B is connected to the pin, the function of the COM1x1:0 bits is depen-

dent of the WGM13:0 bits setting. Table 15-1 shows the COM1x1:0 bit functionality when the

WGM13:0 bits are set to a Normal or a CTC mode (non-PWM).

Table 15-2 shows the COM1x1:0 bit functionality when the WGM13:0 bits are set to the fast

PWM mode.

Note:

1. A special case occurs when OCR1A/OCR1B equals TOP and COM1A1/COM1B1 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 120. for more details.

Bit

(0x80)

COM1A1

COM1A0

COM1B1

COM1B0

–

WGM11

WGM10

TCCR1A

Read/Write

R/W

Initial Value

Table 15-1.

Compare Output Mode, non-PWM

COM1A1/COM1B1

COM1A0/COM1B0

Description

Normal port operation, OC1A/OC1B disconnected.

Toggle OC1A/OC1B on Compare Match.

Clear OC1A/OC1B on Compare Match (Set output to

low level).

Set OC1A/OC1B on Compare Match (Set output to

high level).

Table 15-2.

Compare Output Mode, Fast PWM(1)

COM1A1/COM1B1

COM1A0/COM1B0

Description

Normal port operation, OC1A/OC1B disconnected.

WGM13:0 = 14 or 15: Toggle OC1A on Compare

Match, OC1B disconnected (normal port operation).

For all other WGM1 settings, normal port operation,

OC1A/OC1B disconnected.

Clear OC1A/OC1B on Compare Match, set

OC1A/OC1B at BOTTOM (non-inverting mode)

Set OC1A/OC1B on Compare Match, clear

OC1A/OC1B at BOTTOM (inverting mode)

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