ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 132

• Manufacturer Part Number: ATmega88PA Automotive
• Manufacturer: Atmel Corporation

132
Atmel ATmega48PA/88PA/168PA [Preliminary]
Figure 16-12
and frequency correct PWM mode the OCR1x 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 TOV1 Flag at BOTTOM.
Figure 16-12. Timer/Counter Timing Diagram, no Prescaling
Figure 16-13
Figure 16-13. Timer/Counter Timing Diagram, with Prescaler (f
and ICF n
(PC and PFC PWM)
and ICFn
(CTC and FPWM)
TOVn
(Update at TOP)
(PC and PFC PWM)
TOVn
(CTC and FPWM)
(Update at TOP)
TCNTn
TCNTn
OCRnx
as TOP)
(clk
TCNTn
TCNTn
OCRnx
shows the same timing data, but with the prescaler enabled.
(clk
as TOP)
shows the count sequence close to TOP in various modes. When using phase
clk
clk
clk
clk
I/O
(FPWM)
I/O
(FPWM)
I/O
Tn
I/O
Tn
/8)
(if used
/1)
(if used
TOP - 1
TOP - 1
TOP - 1
TOP - 1
Old OCRnx Value
Old OCRnx Value
TOP
TOP
TOP
TOP
BOTTOM
BOTTOM
TOP - 1
TOP - 1
clk_I/O
New OCRnx Value
New OCRnx Value
/8)
BOTTOM + 1
BOTTOM + 1
TOP - 2
TOP - 2
9223B–AVR–09/11