AT90SCR100 datasheet(129/433 Pages) ATMEL

129 / 433 page

129

TPR0327AY–SMS–30Jan09

AT90SCR100

When a capture is triggered according to the ICESn 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

13-21 and Figure 13-22.

If external pin modes are used for the Timer/Countern, transitions on the Tn pin will clock the

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

counting.

13.2.10.3

TCCR1C – Timer/Counter1 Control Register C

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

• Bit 6 – FOC1B: Force Output Compare for Channel 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.

Table 13-15.

Clock Select Bit Description

CS12

CS11

CS10

Description

No clock source (Timer/Counter stopped).

clkI/O/1 (No prescaling)

clkI/O/8 (From prescaler)

clkI/O/64 (From prescaler)

clkI/O/256 (From prescaler)

clkI/O/1024 (From prescaler)

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

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

Bit

7654

$000082

FOC1A

FOC1B

TCCR1C

Read/write

R/W

Initial value

0000

0x00

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