ATA6616-P3PW Atmel, ATA6616-P3PW Datasheet - Page 118
ATA6616-P3PW
Manufacturer Part Number
ATA6616-P3PW
Description
TXRX MULTICHIP MOD LIN SIP 38QFN
Manufacturer
Atmel
Series
AVR® ATA66 LIN-SBCr
Datasheet
1.ATA6617-EK.pdf
(308 pages)
Specifications of ATA6616-P3PW
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, LIN, SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
16
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
38-VQFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Atmel ATA6616/ATA6617
Figure 4-35. Fast PWM Mode, Timing Diagram
The Timer/Counter Overflow Flag (TOV0) is set each time the counter reaches MAX. If the
interrupt is enabled, the interrupt handler routine can be used for updating the compare value.
In fast PWM mode, the compare unit allows generation of PWM waveforms on the OC0A pin.
Setting the COM0A1:0 bits to two will produce a non-inverted PWM and an inverted PWM out-
put can be generated by setting the COM0A1:0 to three (See
actual OC0A 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 setting (or clearing) the OC0A Register at the
compare match between OCR0A and TCNT0, and clearing (or setting) the OC0A Register at
the timer clock cycle the counter is cleared (changes from MAX to BOTTOM).
The PWM frequency for the output can be calculated by the following equation:
The N variable represents the prescale factor (1, 8, 32, 64, 128, 256, or 1024).
The extreme values for the OCR0A Register represent special cases when generating a PWM
waveform output in the fast PWM mode. If the OCR0A is set equal to BOTTOM, the output will
be a narrow spike for each MAX+1 timer clock cycle. Setting the OCR0A equal to MAX will
result in a constantly high or low output (depending on the polarity of the output set by the
COM0A1:0 bits.)
A frequency (with 50% duty cycle) waveform output in fast PWM mode can be achieved by
setting OC0A to toggle its logical level on each compare match (COM0A1:0 = 1). The wave-
form generated will have a maximum frequency of f
This feature is similar to the OC0A toggle in CTC mode, except the double buffer feature of the
Output Compare unit is enabled in the fast PWM mode.
f
OCnxPWM
TCNTn
OCnx
OCnx
Period
=
-------------------- -
N
f
clk_I/O
256
1
2
3
4
5
oc0A
6
= f
clk_I/O
7
Table 4-31 on page
/2 when OCR0A is set to zero.
OCRnx Interrupt Flag Set
OCRnx Update and
TOVn Interrupt Flag Set
(COMnx1:0 = 2)
(COMnx1:0 = 3)
9132D–AUTO–12/10
124). The
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