ATA6603-EK Atmel, ATA6603-EK Datasheet - Page 120
ATA6603-EK
Manufacturer Part Number
ATA6603-EK
Description
MCU, MPU & DSP Development Tools Demoboard LIN-MCM
Manufacturer
Atmel
Datasheet
1.ATA6603P-PLQW.pdf
(360 pages)
Specifications of ATA6603-EK
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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ATA6602/ATA6603
Figure 4-33. Phase Correct PWM Mode, Timing Diagram
The Timer/Counter Overflow Flag (TOV0) is set each time the counter reaches BOTTOM. The
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
OC0x pins. Setting the COM0x1:0 bits to two will produce a non-inverted PWM. An inverted
PWM output can be generated by setting the COM0x1:0 to three: Setting the COM0A0 bits to
one allows the OC0A pin to toggle on Compare Matches if the WGM02 bit is set. This option is
not available for the OC0B pin (see
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 OC0x Register at the compare match between OCR0x and
TCNT0 when the counter increments, and setting (or clearing) the OC0x Register at compare
match between OCR0x and TCNT0 when the counter decrements. The PWM frequency for the
output when using phase correct PWM can be calculated by the following equation:
The N variable represents the prescale factor (1, 8, 64, 256, or 1024).
The extreme values for the OCR0A Register represent special cases when generating a PWM
waveform output in the phase correct PWM mode. If the OCR0A is set equal to BOTTOM, the
output will be continuously low and if set equal to MAX the output will be continuously high for
non-inverted PWM mode. For inverted PWM the output will have the opposite logic values.
f
OCnxPCPWM
TCNTn
OCn
OCn
Period
=
-------------------- -
N
f
clk_I/O
510
1
Table 4-49 on page
2
125). The actual OC0x value will only be
3
(COMnx1:0 = 2)
(COMnx1:0 = 3)
OCRnx Update
TOVn Interrupt
OCnx Interrupt
Flag Set
Flag Set
4921E–AUTO–09/09
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