ATA8741-PXQW【PDF 132/238 页】MCU W/TRANSMITTER ASK/FSK 24QFN

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132

9140CINDCO02/10

ATA8741

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

21-10 and Figure 21-11.

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.

21.11.3 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.

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

FOC1A/FOC1B bits are implemented as strobes. Therefore it is the value present in the

COM1x1:0 bits that determine the effect of the forced compare.

Table 21-5. Clock Select Bit Description

CS12

CS11

CS10

Description

No clock source (Timer/Counter stopped).

clk

I/O

/1 (No prescaling)

clk

I/O

/8 (From prescaler)

clk

I/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

0x22 (0x42)

FOC1A

FOC1B

TCCR1C

Read/Write

Initial Value

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