ATMEGA128A-MU Atmel, ATMEGA128A-MU Datasheet - Page 101
![MCU 8BIT 128K ISP FLASH 64-QFN](/photos/12/13/121326/313-64-qfn_sml.jpg)
ATMEGA128A-MU
Manufacturer Part Number
ATMEGA128A-MU
Description
MCU 8BIT 128K ISP FLASH 64-QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA128A-MU
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
4K 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
64-MLF®, 64-QFN
Processor Series
ATMEGA128x
Core
AVR8
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
Controller Family/series
AVR MEGA
No. Of I/o's
53
Eeprom Memory Size
4KB
Ram Memory Size
4KB
Cpu Speed
16MHz
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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14.7.4
8151H–AVR–02/11
Phase Correct PWM Mode
The phase correct PWM mode (WGM01:0 = 1) provides a high resolution phase correct PWM
waveform generation option. The phase correct PWM mode is based on a dual-slope operation.
The counter counts repeatedly from BOTTOM to MAX and then from MAX to BOTTOM. In non-
inverting Compare Output mode, the output compare (OC0) is cleared on the compare match
between TCNT0 and OCR0 while counting up, and set on the compare match while downcount-
ing. In inverting Output Compare mode, the operation is inverted. The dual-slope operation has
lower maximum operation frequency than single slope operation. However, due to the symmet-
ric feature of the dual-slope PWM modes, these modes are preferred for motor control
applications.
The PWM resolution for the phase correct PWM mode is fixed to 8 bits. In phase correct PWM
mode the counter is incremented until the counter value matches Max When the counter
reaches MAX, it changes the count direction. The TCNT0 value will be equal to MAX for one
timer clock cycle. The timing diagram for the phase correct PWM mode is shown on
The TCNT0 value is in the timing diagram shown as a histogram for illustrating the dual-slope
operation. The diagram includes non-inverted and inverted PWM outputs. The small horizontal
line marks on the TCNT0 slopes represent compare matches between OCR0 and TCNT0.
Figure 14-7. Phase Correct PWM Mode, Timing Diagram
The Timer/Counter Overflow Flag (
interrupt flag can be used to generate an interrupt each time the counter reaches the BOTTOM
value.
In phase correct PWM mode, the compare unit allows generation of PWM waveforms on the
OC0 pin. Setting the COM01:0 bits to 2 will produce a non-inverted PWM. An inverted PWM out-
put can be generated by setting the COM01:0 to 3 (See
OC0 value will only be visible on the port pin if the data direction for the port pin is set as output.
The PWM waveform is generated by clearing (or setting) the OC0 Register at the compare
match between OCR0 and TCNT0 when the counter increments, and setting (or clearing) the
OC0 Register at compare match between OCR0 and TCNT0 when the counter decrements. The
TCNTn
OCn
OCn
Period
1
TOV0
) is set each time the counter reaches BOTTOM. The
2
Table 14-5 on page
3
ATmega128A
OCn Interrupt Flag Set
OCRn Update
TOVn Interrupt Flag Set
(COMn1:0 = 2)
(COMn1:0 = 3)
108). The actual
Figure
14-7.
101
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