ATmega168PA Automotive Atmel Corporation, ATmega168PA Automotive Datasheet - Page 154
ATmega168PA Automotive
Manufacturer Part Number
ATmega168PA Automotive
Description
Manufacturer
Atmel Corporation
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18.8
154
Timer/Counter Timing Diagrams
Atmel ATmega48PA/88PA/168PA [Preliminary]
The following figures show the Timer/Counter in synchronous mode, and the timer clock
(clk
replaced by the Timer/Counter Oscillator clock. The figures include information on when Inter-
rupt Flags are set.
figure shows the count sequence close to the MAX value in all modes other than phase correct
PWM mode.
Figure 18-8. Timer/Counter Timing Diagram, no Prescaling
Figure 18-9
Figure 18-9. Timer/Counter Timing Diagram, with Prescaler (f
Figure 18-10
Figure 18-10. Timer/Counter Timing Diagram, Setting of OCF2A, with Prescaler (f
T2
) is therefore shown as a clock enable signal. In asynchronous mode, clk
shows the same timing data, but with the prescaler enabled.
TCNTn
TCNTn
(clk
TCNTn
(clk
(clk
OCRnx
TOVn
OCFnx
TOVn
clk
shows the setting of OCF2A in all modes except CTC mode.
clk
clk
clk
clk
clk
I/O
I/O
I/O
I/O
I/O
Tn
I/O
Tn
Tn
/1)
/8)
/8)
Figure 18-8
OCRnx - 1
MAX - 1
MAX - 1
contains timing data for basic Timer/Counter operation. The
OCRnx
MAX
MAX
OCRnx Value
OCRnx + 1
BOTTOM
BOTTOM
clk_I/O
/8)
BOTTOM + 1
BOTTOM + 1
OCRnx + 2
9223B–AVR–09/11
I/O
clk_I/O
should be
/8)
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