AT90CAN128-16MJ Atmel, AT90CAN128-16MJ Datasheet - Page 105
![IC MCU AVR FLASH 128K 64-QFN](/photos/12/13/121326/313-64-qfn_sml.jpg)
AT90CAN128-16MJ
Manufacturer Part Number
AT90CAN128-16MJ
Description
IC MCU AVR FLASH 128K 64-QFN
Manufacturer
Atmel
Series
AVR® 90CANr
Specifications of AT90CAN128-16MJ
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
CAN, EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
128KB (128K x 8)
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-VQFN Exposed Pad, 64-HVQFN, 64-SQFN, 64-DHVQFN
For Use With
ATDVK90CAN1 - KIT DEV FOR AT90CAN128 MCU
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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12.7.3
7679H–CAN–08/08
Fast PWM Mode
Figure 12-5. CTC Mode, Timing Diagram
An interrupt can be generated each time the counter value reaches the TOP value by using the
OCF0A flag. If the interrupt is enabled, the interrupt handler routine can be used for updating the
TOP value. However, changing TOP to a value close to BOTTOM when the counter is running
with none or a low prescaler value must be done with care since the CTC mode does not have
the double buffering feature. If the new value written to OCR0A is lower than the current value of
TCNT0, the counter will miss the compare match. The counter will then have to count to its max-
imum value (0xFF) and wrap around starting at 0x00 before the compare match can occur.
For generating a waveform output in CTC mode, the OC0A output can be set to toggle its logical
level on each compare match by setting the Compare Output mode bits to toggle mode
(COM0A1:0 = 1). The OC0A value will not be visible on the port pin unless the data direction for
the pin is set to output. The waveform generated will have a maximum frequency of f
f
equation:
The N variable represents the prescale factor (1, 8, 64, 256, or 1024).
As for the Normal mode of operation, the TOV0 flag is set in the same timer clock cycle that the
counter counts from MAX to 0x00.
The fast Pulse Width Modulation or fast PWM mode (WGM01:0 = 3) provides a high frequency
PWM waveform generation option. The fast PWM differs from the other PWM option by its sin-
gle-slope operation. The counter counts from BOTTOM to MAX then restarts from BOTTOM. In
non-inverting Compare Output mode, the Output Compare (OC0A) is cleared on the compare
match between TCNT0 and OCR0A, and set at BOTTOM. In inverting Compare Output mode,
the output is set on compare match and cleared at BOTTOM. Due to the single-slope operation,
the operating frequency of the fast PWM mode can be twice as high as the phase correct PWM
mode that use dual-slope operation. This high frequency makes the fast PWM mode well suited
for power regulation, rectification, and DAC applications. High frequency allows physically small
sized external components (coils, capacitors), and therefore reduces total system cost.
In fast PWM mode, the counter is incremented until the counter value matches the MAX value.
The counter is then cleared at the following timer clock cycle. The timing diagram for the fast
PWM mode is shown in
togram for illustrating the single-slope operation. The diagram includes non-inverted and
clk_I/O
/2 when OCR0A is set to zero (0x00). The waveform frequency is defined by the following
TCNTn
OCnx
(Toggle)
Period
Figure
1
f
OCnx
12-6. The TCNT0 value is in the timing diagram shown as a his-
=
------------------------------------------------- -
2 N
2
⋅
⋅
(
f
clk_I/O
1
+
3
OCRnx
)
4
AT90CAN32/64/128
OCnx Interrupt Flag Set
(COMnx1:0 = 1)
OC0A
105
=
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