ATMEGA64L-8MI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA64L-8MI

8-bit AVR® Microcontroller with 64K Bytes In-System Programmable Flash

Atmel Corporation 

Figure 56. Timer/Counter Timing Diagram, Setting of OCFnx, with Prescaler (fclk_I/O/8)

clkI/O

clkTn

(clkI/O/8)

TCNTn

OCRnx - 1

OCRnx

OCRnx + 1

OCRnx + 2

OCRnx

OCRnx Value

OCFnx

Figure 57 shows the count sequence close to TOP in various modes. When using phase

and 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 57. Timer/Counter Timing Diagram, no Prescaling

clkI/O

clkTn

(clkI/O/1)

TCNTn

(CTC and FPWM)

TCNTn

(PC and PFC PWM)

TOVn (FPWM)

and ICFn (if used

as TOP)

OCRnx

(Update at TOP)

TOP - 1

TOP - 1

TOP

TOP

Old OCRnx Value

BOTTOM

TOP - 1

BOTTOM + 1

TOP - 2

New OCRnx Value

Figure 58 shows the same timing data, but with the prescaler enabled.

130 ATmega64(L)

2490G–AVR–03/04

Share Link: