ATmega169P datasheet(131/393 Pages) ATMEL

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131

8018N–AVR–08/09

ATmega169P

When a capture is triggered according to the ICES1 setting, the counter value is copied into the

Input Capture Register (ICR1). The event will also set the Input Capture Flag (ICF1), and this

can be used to cause an Input Capture Interrupt, if this interrupt is enabled.

When the ICR1 is used as TOP value (see description of the WGM13:0 bits located in the

TCCR1A and the TCCR1B Register), the ICP1 is disconnected and consequently the Input Cap-

ture function is disabled.

• Bit 5 – Reserved Bit

This bit is reserved for future use. For ensuring compatibility with future devices, this bit must be

written to zero when TCCR1B is written.

• Bit 4:3 – WGM13:2: Waveform Generation Mode

See TCCR1A Register description.

• Bit 2:0 – CS12:0: Clock Select

The three Clock Select bits select the clock source to be used by the Timer/Counter, see Figure

15-10 and Figure 15-11.

If external pin modes are used for the Timer/Counter1, transitions on the T1 pin will clock the

counter even if the pin is configured as an output. This feature allows software control of the

counting.

15.11.3

TCCR1C – Timer/Counter1 Control Register C

• Bit 7 – FOC1A: Force Output Compare for Unit A

• Bit 6 – FOC1B: Force Output Compare for Unit B

The FOC1A/FOC1B bits are only active when the WGM13:0 bits specifies a non-PWM mode.

However, for ensuring compatibility with future devices, these bits must be set to zero when

TCCR1A is written when operating in a PWM mode. When writing a logical one to the

FOC1A/FOC1B bit, an immediate compare match is forced on the Waveform Generation unit.

The OC1A/OC1B output is changed according to its COM1x1:0 bits setting. Note that the

Table 15-5.

Clock Select Bit Description

CS12

CS11

CS10

Description

No clock source (Timer/Counter stopped).

clkI/O/1 (No prescaling)

clk

I/O/8 (From prescaler)

clkI/O/64 (From prescaler)

clk

I/O/256 (From prescaler)

clk

I/O/1024 (From prescaler)

External clock source on T1 pin. Clock on falling edge.

External clock source on T1 pin. Clock on rising edge.

Bit

765

210

(0x82)

FOC1A

FOC1B

–

TCCR1C

Read/Write

R/W

Initial Value

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