ATMEGA644PV ATMEL [ATMEL Corporation], ATMEGA644PV Datasheet - Page 130

• Manufacturer Part Number: ATMEGA644PV
• Description: 8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

130
ATmega164P/324P/644P
Figure 14-11. Timer/Counter Timing Diagram, Setting of OCFnx, with Prescaler (f
Figure 14-12
frequency correct PWM mode the OCRnx Register is updated at BOTTOM. The timing diagrams
will be the same, but TOP should be replaced by BOTTOM, TOP-1 by BOTTOM+1 and so on.
The same renaming applies for modes that set the TOVn Flag at BOTTOM.
Figure 14-12. Timer/Counter Timing Diagram, no Prescaling
Figure 14-13
(PC and PFC PWM)
and ICFn
(CTC and FPWM)
TCNTn
OCRnx
(Update at TOP)
(clk
OCFnx
TOVn
clk
clk
OCRnx
I/O
TCNTn
TCNTn
as TOP)
(clk
I/O
Tn
clk
clk
/8)
I/O
(FPWM)
shows the count sequence close to TOP in various modes. When using phase and
shows the same timing data, but with the prescaler enabled.
I/O
Tn
/1)
(if used
OCRnx - 1
TOP - 1
TOP - 1
Old OCRnx Value
OCRnx
OCRnx Value
TOP
TOP
OCRnx + 1
BOTTOM
TOP - 1
New OCRnx Value
OCRnx + 2
BOTTOM + 1
TOP - 2
clk_I/O
8011D–AVR–02/07
/8)