ATMEGA32U4-MUR Atmel, ATMEGA32U4-MUR Datasheet - Page 154
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ATMEGA32U4-MUR
Manufacturer Part Number
ATMEGA32U4-MUR
Description
MCU AVR 16K FLASH 16MHZ 44VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA16U4-MU.pdf
(433 pages)
Specifications of ATMEGA32U4-MUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
26
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2.5K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-VQFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Part Number:
ATMEGA32U4-MUR
Manufacturer:
UCC
Quantity:
1 001
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15.8.4
7766F–AVR–11/10
PWM6 Mode
The N variable represents the number of steps in dual-slope operation. The value of N equals to
the TOP value.
The extreme values for the OCR4C Register represent special cases when generating a PWM
waveform output in the Phase and Frequency Correct PWM mode. If the OCR4C is set equal to
BOTTOM, the output will be continuously low and if set equal to MAX the output will be continu-
ously high for non-inverted PWM mode. For inverted PWM the output will have the opposite
logic values.
The general I/O port function is overridden by the Output Compare value (OC4x / OC4x) from
the Dead Time Generator, if either of the COM4x1:0 bits are set and the Data Direction Register
bits for the OC4X and OC4X pins are set as an output. If the COM4x1:0 bits are cleared, the
actual value from the port register will be visible on the port pin. The configurations of the Output
Compare Pins are described in
Table 15-4.
The PWM6 Mode (PWM4A = 1, WGM41 = 1 and WGM40 = x) provide PWM waveform genera-
tion option e.g. for controlling Brushless DC (BLDC) motors. In the PWM6 Mode the OCR4A
Register controls all six Output Compare waveforms as the same Waveform Output (OCW4A)
from the Waveform Generator is used for generating all waveforms. The PWM6 Mode also pro-
vides an Output Compare Override Enable Register (OC4OE) that can be used with an instant
response for disabling or enabling the Output Compare pins. If the Output Compare Override
Enable bit is cleared, the actual value from the port register will be visible on the port pin.
The PWM6 Mode provides two counter operation modes, a single-slope operation and a dual-
slope operation. If the single-slope operation is selected (the WGM40 bit is set to 0), the counter
counts from BOTTOM to TOP (defined as OCR4C) then restart from BOTTOM like in Fast PWM
Mode. The PWM waveform is generated by setting (or clearing) the Waveform Output (OCW4A)
at the Compare Match between OCR4A and TCNT4, and clearing (or setting) the Waveform
Output at the timer clock cycle the counter is cleared (changes from TOP to BOTTOM). The
Timer/Counter Overflow Flag (TOV4) is set each time the counter reaches the TOP and, if the
interrupt is enabled, the interrupt handler routine can be used for updating the compare value.
Whereas, if the dual-slope operation is selected (the WGM40 bit is set to 1), the counter counts
repeatedly from BOTTOM to TOP (defined as OCR4C) and then from TOP to BOTTOM like in
Phase and Frequency Correct PWM Mode. The PWM waveform is generated by setting (or
clearing) the Waveform Output (OCW4A) at the Compare Match between OCR4A and TCNT4
when the counter increments, and clearing (or setting) the Waveform Output at the he Compare
Match between OCR4A and TCNT4 when the counter decrements. The Timer/Counter Overflow
Flag (TOV4) is set each time the counter reaches the BOTTOM and, if the interrupt is enabled,
the interrupt handler routine can be used for updating the compare value.
The timing diagram for the PWM6 Mode in single-slope operation (WGM41 = 0) when the
COM4A1:0 bits are set to “10” is shown in
COM4x1
0
0
1
1
Output Compare pin configurations in Phase and Frequency Correct PWM Mode
COM4x0
0
1
0
1
Table
OC4x Pin
Disconnected
OC4x
Disconnected
Disconnected
15-4.
Figure
15-15. The counter is incremented until the
ATmega16/32U4
OC4x Pin
Disconnected
OC4x
OC4x
OC4x
154
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