ATMEGA64M1-15MZ Atmel, ATMEGA64M1-15MZ Datasheet - Page 138

• Manufacturer Part Number: ATMEGA64M1-15MZ
• Description: MCU AVR 64KB FLASH 3PSC 32-VQFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA64M1-15MZ

• Package / Case: 32-VQFN
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Eeprom Size: 2K x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Program Memory Size: 64KB (64K x 8)
• Data Converters: A/D 11x10b; D/A 1x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Connectivity: CAN, LIN, SPI, UART/USART
• Core Size: 8-Bit
• Processor Series: ATMEGA64x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATADAPCAN01
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Lead Free Status / Rohs Status: Details

14.5
14.5.1
14.5.2
138
Functional Description
Atmel ATmega16/32/64/M1/C1
Generation of Control Waveforms
Waveform Cycles
The PSC is based on the use of a free-running 12-bit counter (PSC counter). This counter is
able to count up to a top value determined by the contents of POCR_RB register and then
according to the selected running mode, count down or reset to zero for another cycle.
As can be seen from the block diagram
Each of the 3 PSC modules can be seen as two symetrical entities. One entity named part A
which generates the output PSCOUTnA and the second one named part B which generates
the PSCOUTnB output.
Each module has its own PSC Input circuitry which manages the corresponding input.
In general, the drive of a 3 phase motor requires the generation of 6 PWM signals. The duty
cycle of these signals must be independently controlled to adjust the speed or torque of the
motor or to produce the wanted waveform on the 3 voltage lines (trapezoidal, sinusoidal...)
In case of cross conduction or overtemperature, having inputs which can immediately disable
the waveform generator’s outputs is desirable.
These considerations are common for many systems which require PWM signals to drive
power systems such as lighting, DC/DC converters...
Each of the 3 modules has 2 waveform generators which jointly compose the output signal.
The first part of the waveform is relative to part A or PSCOUTnA output. This waveform corre-
sponds to sub-cycle A in the following figure.
The second part of the waveform is relative to part B or PSCOUTnB output. This waveform
corresponds to sub-cycle B in the following figure.
The complete waveform is terminated at the end of the sub-cycle B, whereupon any changes
to the settings of the waveform generator registers will be implemented, for the next cycle.
The PSC can be configured in one of two modes (1Ramp Mode or Centered Mode). This con-
figuration will affect the operation of all the waveform generators.
Figure 14-2. Cycle Presentation in One Ramp Mode
PSC Counter Value
Sub-Cycle A
One PSC Cycle
Figure
Sub-Cycle B
14-1, the PSC is composed of 3 modules.
UPDATE
7647G–AVR–09/11