ATmega64M1 Atmel Corporation, ATmega64M1 Datasheet - Page 135
ATmega64M1
Manufacturer Part Number
ATmega64M1
Description
Manufacturer
Atmel Corporation
Specifications of ATmega64M1
Flash (kbytes)
64 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
27
Ext Interrupts
27
Usb Speed
No
Usb Interface
No
Spi
1
Uart
1
Can
1
Lin
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
Adc Resolution (bits)
10
Adc Speed (ksps)
125
Analog Comparators
4
Resistive Touch Screen
No
Dac Channels
1
Dac Resolution (bits)
10
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
4
Eeprom (bytes)
2048
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
2
Output Compare Channels
14
Input Capture Channels
1
Pwm Channels
10
32khz Rtc
No
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATmega64M1-15MD
Manufacturer:
ATMEL
Quantity:
700
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17.5
17.5.1
17.5.2
8209D–AVR–11/10
Functional Description
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
modules.
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, and so
on).
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, and so on.
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 cor-
responds 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 config-
uration will affect the operation of all the waveform generators.
Figure 17-2. Cycle Presentation in One Ramp Mode
PSC Counter Value
Sub-Cycle A
One PSC Cycle
Sub-Cycle B
Figure 17-1 on page
ATmega16M1/32M1/64M1
UPDATE
134, the PSC is composed of 3
135
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