ATTIny2313-16MI ATMEL Corporation, ATTIny2313-16MI Datasheet - Page 96

• Manufacturer Part Number: ATTIny2313-16MI
• Description: 8-bit AVR Microcontroller with 2K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

96
ATtiny2313/V
Figure 44. CTC Mode, Timing Diagram
An interrupt can be generated at each time the counter value reaches the TOP value by
either using the OCF1A or ICF1 flag according to the register used to define the TOP
value. If the interrupt is enabled, the interrupt handler routine can be used for updating
the TOP value. However, changing the TOP to a value close to BOTTOM when the
counter is running with none or a low prescaler value must be done with care since the
CTC mode does not have the double buffering feature. If the new value written to
OCR1A or ICR1 is lower than the current value of TCNT1, the counter will miss the com-
pare match. The counter will then have to count to its maximum value (0xFFFF) and
wrap around starting at 0x0000 before the compare match can occur. In many cases
this feature is not desirable. An alternative will then be to use the fast PWM mode using
OCR1A for defining TOP (WGM13:0 = 15) since the OCR1A then will be double
buffered.
For generating a waveform output in CTC mode, the OC1A output can be set to toggle
its logical level on each compare match by setting the Compare Output mode bits to tog-
gle mode (COM1A1:0 = 1). The OC1A value will not be visible on the port pin unless the
data direction for the pin is set to output (DDR_OC1A = 1). The waveform generated will
have a maximum frequency of f
waveform frequency is defined by the following equation:
The N variable represents the prescaler factor (1, 8, 64, 256, or 1024).
As for the Normal mode of operation, the TOV1 flag is set in the same timer clock cycle
that the counter counts from MAX to 0x0000.
TCNTn
OCnA
(Toggle)
Period
1
f
OCnA
OC
2
1
A
= f
=
clk_I/O
-------------------------------------------------- -
2 N
3
/2 when OCR1A is set to zero (0x0000). The
f
1
clk_I/O
+
4
OCRnA
OCnA Interrupt Flag Set
or ICFn Interrupt Flag Set
(Interrupt on TOP)
(COMnA1:0 = 1)
2543C–AVR–12/03