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ATmega325P датащи(PDF) 135 Page - ATMEL Corporation

номер детали ATmega325P
подробное описание детали  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  364 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega325P датащи(HTML) 135 Page - ATMEL Corporation

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135
8023F–AVR–07/09
ATmega325P/3250P
16. 8-bit Timer/Counter2 with PWM and Asynchronous Operation
16.1
Features
• Single Compare Unit Counter
• Clear Timer on Compare Match (Auto Reload)
• Glitch-free, Phase Correct Pulse Width Modulator (PWM)
• Frequency Generator
• 10-bit Clock Prescaler
• Overflow and Compare Match Interrupt Sources (TOV2 and OCF2A)
• Allows Clocking from External 32 kHz Watch Crystal Independent of the I/O Clock
16.2
Overview
Timer/Counter2 is a general purpose, single compare unit, 8-bit Timer/Counter module. A simpli-
fied block diagram of the 8-bit Timer/Counter is shown in Figure 16-1. For the actual placement
of I/O pins, refer to ”Pinout ATmega3250P” on page 2. CPU accessible I/O Registers, including
I/O bits and I/O pins, are shown in bold. The device-specific I/O Register and bit locations are
listed in the ”Register Description” on page 149.
Figure 16-1. 8-bit Timer/Counter Block Diagram
Timer/Counter
=
TCNTn
Waveform
Generation
OCnx
= 0
Control Logic
= 0xFF
TOP
BOTTOM
count
clear
direction
TOVn
(Int.Req.)
OCnx
(Int.Req.)
Synchronization Unit
OCRnx
TCCRnx
ASSRn
Status flags
clk
I/O
clk
ASY
Synchronized Status flags
asynchronous mode
select (ASn)
TOSC1
T/C
Oscillator
TOSC2
Prescaler
clk
Tn
clk
I/O



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