132
9152BINDCO02/10
ATA8743
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
0
0
0
No clock source (Timer/Counter stopped).
0
0
1
clk
I/O
/1 (No prescaling)
0
1
0
clk
I/O
/8 (From prescaler)
0
1
1
clk
I/O
/64 (From prescaler)
1
0
0
clk
I/O
/256 (From prescaler)
1
0
1
clk
I/O
/1024 (From prescaler)
1
1
0
External clock source on T1 pin. Clock on falling edge.
1
1
1
External clock source on T1 pin. Clock on rising edge.
Bit
7
6
5
4
3
2
1
0
0x22 (0x42)
FOC1A
FOC1B
TCCR1C
Read/Write
W
W
R
R
R
R
R
R
Initial Value
0
0
0
0
0
0
0
0
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