
89
Atmel ATmega16/32/64/M1/C1 [DATASHEET]
7647K–AVR–12/13
12.8.2 Timer/Counter Control Register B – TCCR0B
Bit 7 – FOC0A: Force Output Compare A
The FOC0A bit is only active when the WGM bits specify a non-PWM mode.
However, for ensuring compatibility with future devices, this bit must be set to zero when TCCR0B is written when operating in
PWM mode. When writing a logical one to the FOC0A bit, an immediate compare match is forced on the waveform generation
unit. The OC0A output is changed according to its COM0A1:0 bits setting. Note that the FOC0A bit is implemented as a strobe.
Therefore it is the value present in the COM0A1:0 bits that determines the effect of the forced compare.
A FOC0A strobe will not generate any interrupt, nor will it clear the timer in CTC mode using OCR0A as TOP.
The FOC0A bit is always read as zero.
Bit 6 – FOC0B: Force Output Compare B
The FOC0B bit is only active when the WGM bits specify a non-PWM mode.
However, for ensuring compatibility with future devices, this bit must be set to zero when TCCR0B is written when operating in
PWM mode. When writing a logical one to the FOC0B bit, an immediate compare match is forced on the waveform generation
unit. The OC0B output is changed according to its COM0B1:0 bits setting. Note that the FOC0B bit is implemented as a strobe.
Therefore it is the value present in the COM0B1:0 bits that determines the effect of the forced compare.
A FOC0B strobe will not generate any interrupt, nor will it clear the timer in CTC mode using OCR0B as TOP.
The FOC0B bit is always read as zero.
Bits 5:4 – Res: Reserved Bits
These bits are reserved bits in the ATmega16/32/64/M1/C1 and will always read as zero.
Bit 3 – WGM02: Waveform Generation Mode
Bits 2:0 – CS02:0: Clock Select
The three clock select bits select the clock source to be used by the Timer/Counter.
If external pin modes are used for the Timer/Counter0, transitions on the T0 pin will clock the counter even if the pin is
configured as an output. This feature allows software control of the counting.
Bit
7
6
5
4
3
210
FOC0A
FOC0B
–
WGM02
CS02
CS01
CS00
TCCR0B
Read/Write
W
R
R/W
Initial Value
0
Table 12-9. Clock Select Bit Description
CS02
CS01
CS00
Description
0
No clock source (Timer/Counter stopped)
0
1
clkI/O/(no prescaling)
0
1
0
clkI/O/8 (from prescaler)
0
1
clkI/O/64 (from prescaler)
1
0
clkI/O/256 (from prescaler)
1
0
1
clkI/O/1024 (from prescaler)
1
0
External clock source on T0 pin. Clock on falling edge.
1
External clock source on T0 pin. Clock on rising edge.