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ATMEGA325P 数据表(PDF) 99 Page - ATMEL Corporation

部件名 ATMEGA325P
功能描述  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
Download  336 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

ATMEGA325P 数据表(HTML) 99 Page - ATMEL Corporation

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99
8023A–AVR–12/06
ATmega325P/3250P
Figure 13-7. 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
OC0A pin. Setting the COM0A1:0 bits to two will produce a non-inverted PWM. An inverted
PWM output can be generated by setting the COM0A1:0 to three (See Table 13-5 on page 104).
The 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 clearing (or setting) the OC0A Register at the
compare match between OCR0A and TCNT0 when the counter increments, and setting (or
clearing) the OC0A Register at compare match between OCR0A and TCNT0 when the counter
decrements. The PWM frequency for the output when using phase correct PWM can be calcu-
lated 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.
At the very start of period 2 in Figure 13-7 OCn has a transition from high to low even though
there is no Compare Match. The point of this transition is to guarantee symmetry around BOT-
TOM. There are two cases that give a transition without Compare Match.
• OCR0A changes its value from MAX, like in Figure 13-7. When the OCR0A value is MAX the
OCn pin value is the same as the result of a down-counting Compare Match. To ensure
TOVn Interrupt Flag Set
OCnx Interrupt Flag Set
1
2
3
TCNTn
Period
OCn
OCn
(COMnx1:0 = 2)
(COMnx1:0 = 3)
OCRnx Update
f
OCnxPCPWM
f
clk_I/O
N 510
------------------
=


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