ATMEGA169 ATMEL [ATMEL Corporation], ATMEGA169 Datasheet - Page 133
ATMEGA169
Manufacturer Part Number
ATMEGA169
Description
8-bit Microcontroller with 16K Bytes In-System Programmable Flash
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.ATMEGA169.pdf
(365 pages)
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Timer/Counter Timing
Diagrams
2514P–AVR–07/06
•
The following figures show the Timer/Counter in synchronous mode, and the timer clock
(clk
be replaced by the Timer/Counter Oscillator clock. The figures include information on
when Interrupt Flags are set. Figure 60 contains timing data for basic Timer/Counter
operation. The figure shows the count sequence close to the MAX value in all modes
other than phase correct PWM mode.
Figure 60. Timer/Counter Timing Diagram, no Prescaling
Figure 61 shows the same timing data, but with the prescaler enabled.
Figure 61. Timer/Counter Timing Diagram, with Prescaler (f
Figure 62 shows the setting of OCF2A in all modes except CTC mode.
TCNTn
T2
(clk
TCNTn
(clk
The timer starts counting from a value higher than the one in OCR2A, and for that
reason misses the Compare Match and hence the OCn change that would have
happened on the way up.
TOVn
TOVn
clk
clk
clk
clk
) is therefore shown as a clock enable signal. In asynchronous mode, clk
I/O
I/O
I/O
Tn
I/O
Tn
/1)
/8)
MAX - 1
MAX - 1
MAX
MAX
BOTTOM
BOTTOM
clk_I/O
ATmega169/V
/8)
BOTTOM + 1
BOTTOM + 1
I/O
should
133
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