ATMEGA325A-MU Atmel, ATMEGA325A-MU Datasheet - Page 128
![IC MCU AVR 32K FLASH 64VQFN](/photos/12/13/121326/313-64-qfn_sml.jpg)
ATMEGA325A-MU
Manufacturer Part Number
ATMEGA325A-MU
Description
IC MCU AVR 32K FLASH 64VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA325A-MU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-VFQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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15.10 Timer/Counter Timing Diagrams
128
ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/645
The extreme values for the OCR1x Register represents special cases when generating a PWM
waveform output in the phase and frequency correct PWM mode. If the OCR1x is set equal to
BOTTOM the output will be continuously low and if set equal to TOP the output will be set to
high for non-inverted PWM mode. For inverted PWM the output will have the opposite logic val-
ues. If OCR1A is used to define the TOP value (WGM1[3:0] = 9) and COM1A1:0 = 1, the OC1A
output will toggle with a 50% duty cycle.
The Timer/Counter is a synchronous design and the timer clock (clk
clock enable signal in the following figures. The figures include information on when Interrupt
Flags are set, and when the OCR1x Register is updated with the OCR1x buffer value (only for
modes utilizing double buffering).
Figure 15-10. Timer/Counter Timing Diagram, Setting of OCF1x, no Prescaling
Figure 15-11
Figure 15-11. Timer/Counter Timing Diagram, Setting of OCF1x, with Prescaler (f
Figure 15-12
frequency correct PWM mode the OCR1x Register is updated at BOTTOM. The timing diagrams
will be the same, but TOP should be replaced by BOTTOM, TOP-1 by BOTTOM+1 and so on.
The same renaming applies for modes that set the TOV1 Flag at BOTTOM.
TCNTn
OCRnx
OCFnx
(clk
TCNTn
OCRnx
(clk
OCFnx
clk
clk
clk
clk
I/O
I/O
I/O
Tn
I/O
Tn
/1)
/8)
shows the same timing data, but with the prescaler enabled.
shows the count sequence close to TOP in various modes. When using phase and
OCRnx - 1
OCRnx - 1
Figure 15-10
OCRnx
OCRnx
OCRnx Value
OCRnx Value
shows a timing diagram for the setting of OCF1x.
OCRnx + 1
OCRnx + 1
T1
) is therefore shown as a
OCRnx + 2
OCRnx + 2
clk_I/O
8285B–AVR–03/11
/8)
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