ATMEGA32A-MUR Atmel, ATMEGA32A-MUR Datasheet - Page 78
![MCU AVR 32KB FLASH 16MHZ 44QFN](/photos/12/13/121316/313-44-qfn_sml.jpg)
ATMEGA32A-MUR
Manufacturer Part Number
ATMEGA32A-MUR
Description
MCU AVR 32KB FLASH 16MHZ 44QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA32A-MU.pdf
(353 pages)
Specifications of ATMEGA32A-MUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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14.6.1
14.7
14.7.1
14.7.2
8155C–AVR–02/11
Modes of Operation
Compare Output Mode and Waveform Generation
Normal Mode
Clear Timer on Compare Match (CTC) Mode
The Waveform Generator uses the COM0[1:0] bits differently in normal, CTC, and PWM modes.
For all modes, setting the COM0[1:0] = 0 tells the waveform generator that no action on the OC0
Register is to be performed on the next compare match. For compare output actions in the non-
PWM modes refer to
85, and for phase correct PWM refer to
A change of the COM0[1:0] bits state will have effect at the first compare match after the bits are
written. For non-PWM modes, the action can be forced to have immediate effect by using the
FOC0 strobe bits.
The mode of operation, that is, the behavior of the Timer/Counter and the Output Compare pins,
is defined by the combination of the Waveform Generation mode (WGM01:0) and Compare Out-
put mode (COM0[1:0]) bits. The Compare Output mode bits do not affect the counting
sequence, while the Waveform Generation mode bits do. The COM0[1:0] bits control whether
the PWM output generated should be inverted or not (inverted or non-inverted PWM). For non-
PWM modes the COM0[1:0] bits control whether the output should be set, cleared, or toggled at
a compare match
For detailed timing information refer to
in
The simplest mode of operation is the normal mode (WGM01:0 = 0). In this mode the counting
direction is always up (incrementing), and no counter clear is performed. The counter simply
overruns when it passes its maximum 8-bit value (TOP = 0xFF) and then restarts from the bot-
tom (0x00). In normal operation the Timer/Counter Overflow Flag (
timer clock cycle as the TCNT0 becomes zero. The
bit, except that it is only set, not cleared. However, combined with the timer overflow interrupt
that automatically clears the
There are no special cases to consider in the normal mode, a new counter value can be written
anytime.
The output compare unit can be used to generate interrupts at some given time. Using the out-
put compare to generate waveforms in Normal mode is not recommended, since this will occupy
too much of the CPU time.
In Clear Timer on Compare or CTC mode (WGM01:0 = 2), the OCR0 Register is used to manip-
ulate the counter resolution. In CTC mode the counter is cleared to zero when the counter value
(TCNT0) matches the OCR0. The OCR0 defines the top value for the counter, hence also its
resolution. This mode allows greater control of the compare match output frequency. It also sim-
plifies the operation of counting external events.
The timing diagram for the CTC mode is shown in
increases until a compare match occurs between TCNT0 and OCR0, and then counter (TCNT0)
is cleared.
“Timer/Counter Timing Diagrams” on page
(See “Compare Match Output Unit” on page
Table 14-3 on page
TOV
0 Flag, the timer resolution can be increased by software.
Figure
Table 14-5 on page
85. For fast PWM mode, refer to
82.
14-8,
Figure
TOV
Figure
0 Flag in this case behaves like a ninth
14-9,
86.
14-5. The counter value (TCNT0)
77.).
Figure 14-10
TOV
0) will be set in the same
ATmega32A
Table 14-4 on page
and
Figure 14-11
78
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