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ATmega128
8-bit
Timer/Counter
Register
Description
Timer/Counter Control
Register – TCCR2
Bit
Read/ W rite
Initial Value
7
FOC2
W
0
6
WGM20
R/ W
0
5
COM21
R/ W
0
4
COM20
R/ W
0
3
WGM21
R/ W
0
2
CS22
R/ W
0
1
CS21
R/ W
0
0
CS20
R/ W
0
TCCR2
? Bit 7 – FOC2: Force Output Compare
The FOC2 bit is only active when the W GM20 bit specifies a non-P W M mode. However, for
ensuring compatibility with future devices, this bit must be set to zero when TCCR2 is written
when operating in P W M mode. W hen writing a logical one to the FOC2 bit, an immediate com-
pare match is forced on the waveform generation unit. The OC2 output is changed according to
its COM21:0 bits setting. Note that the FOC2 bit is implemented as a strobe. Therefore it is the
value present in the COM21:0 bits that determines the effect of the forced compare.
A FOC2 strobe will not generate any interrupt, nor will it clear the Timer in CTC mode using
OCR2 as TOP.
The FOC2 bit is always read as zero.
? Bit 6, 3 – WGM21:0: Waveform Generation Mode
These bits control the counting sequence of the counter, the source for the maximum (TOP)
counter value, and what type of waveform generation to be used. Modes of operation supported
by the Timer/Counter unit are: Normal mode, Clear Timer on Compare match (CTC) mode, and
two types of Pulse W idth Modulation (P W M) modes. See Table 64 and “Modes of Operation” on
page 149 .
Table 64. W aveform Generation Mode Bit Description
WGM21
WGM20
Timer/Counter Mode
Update of
TOV2 Flag
Mode
0
1
2
3
(CTC2)
0
0
1
1
(PWM2)
0
1
0
1
of Operation
Normal
P W M, Phase Correct
CTC
Fast P W M
TOP
0xFF
0xFF
OCR2
0xFF
OCR2 at
Immediate
TOP
Immediate
BOTTOM
Set on
MAX
BOTTOM
MAX
MAX
Note:
The CTC2 and P W M2 bit definition names are now obsolete. Use the W GM21:0 definitions. How-
ever, the functionality and location of these bits are compatible with previous versions of the timer.
? Bit 5:4 – COM21:0: Compare Match Output Mode
These bits control the Output Compare Pin (OC2) behavior. If one or both of the COM21:0 bits
are set, the OC2 output overrides the normal port functionality of the I/O pin it is connected to.
However, note that the Data Direction Register (DDR) bit corresponding to the OC2 pin must be
set in order to enable the output driver.
W hen OC2 is connected to the pin, the function of the COM21:0 bits depends on the W GM21:0
bit setting. Table 65 shows the COM21:0 bit functionality when the W GM21:0 bits are set to a
normal or CTC mode (non-P W M).
156
2467X–AVR–06/11
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