ATMEGA168PA-PU Atmel, ATMEGA168PA-PU Datasheet - Page 105
ATMEGA168PA-PU
Manufacturer Part Number
ATMEGA168PA-PU
Description
MCU, 8BIT, AVR, 16K FLASH, 28PDIP
Manufacturer
Atmel
Datasheet
1.ATMEGA48A-PU.pdf
(566 pages)
Specifications of ATMEGA168PA-PU
Controller Family/series
Atmega
No. Of I/o's
23
Eeprom Memory Size
512Byte
Ram Memory Size
1KB
Cpu Speed
20MHz
No.
RoHS Compliant
Core Size
8bit
Program Memory Size
16KB
Oscillator Type
External, Internal
Rohs Compliant
Yes
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14.8
8271C–AVR–08/10
Timer/Counter Timing Diagrams
• The timer starts counting from a value higher than the one in OCRnx, and for that reason
The Timer/Counter is a synchronous design and the timer clock (clk
clock enable signal in the following figures. The figures include information on when interrupt
flags are set.
shows the count sequence close to the MAX value in all modes other than phase correct PWM
mode.
Figure 14-8. Timer/Counter Timing Diagram, no Prescaling
Figure 14-9
Figure 14-9. Timer/Counter Timing Diagram, with Prescaler (f
Figure 14-10
mode and PWM mode, where OCR0A is TOP.
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
symmetry around BOTTOM the OCnx value at MAX must correspond to the result of an up-
counting Compare Match.
misses the Compare Match and hence the OCnx change that would have happened on the
way up.
TCNTn
TCNTn
(clk
(clk
TOVn
TOVn
clk
clk
clk
clk
I/O
I/O
I/O
Tn
I/O
Tn
/1)
/8)
shows the same timing data, but with the prescaler enabled.
shows the setting of OCF0B in all modes and OCF0A in all modes except CTC
Figure 14-8
MAX - 1
MAX - 1
contains timing data for basic Timer/Counter operation. The figure
MAX
MAX
BOTTOM
BOTTOM
clk_I/O
/8)
T0
) is therefore shown as a
BOTTOM + 1
BOTTOM + 1
105
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