ATtiny44 datasheet(108/236 Pages) ATMEL

108 / 236 page

108

8006H–AVR–10/09

ATtiny24/44/84

Note:

See “Code Examples” on page 6.

The assembly code example requires that the r17:r16 register pair contains the value to be writ-

ten to TCNT1.

12.10.1

Reusing the Temporary High Byte Register

If writing to more than one 16-bit register where the high byte is the same for all registers written,

then the high byte only needs to be written once. However, note that the same rule of atomic

operation described previously also applies in this case.

12.11 Register Description

12.11.1

TCCR1A – Timer/Counter1 Control Register A

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

• Bit 5:4 – COM1B1:0: Compare Output Mode for Channel 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 12-2 on page 109 shows the COM1x1:0 bit functionality

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

C Code Example

void

TIM16_WriteTCNT

1( unsigned int i )

{

unsigned char

sreg;

unsigned int

/* Save global interrupt flag */

sreg = SREG;

/* Disable interrupts */

_CLI();

/* Set TCNT

1 to i */

TCNT

1 = i;

/* Restore global interrupt flag */

SREG = sreg;

}

Bit

0x2F (0x4F)

COM1A1

COM1A0

COM1B1

COM1B0

–

WGM11

WGM10

TCCR1A

Read/Write

R/W

Initial Value

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