atmega3250v-8auatmega325v-8ai ATMEL Corporation, atmega3250v-8auatmega325v-8ai Datasheet - Page 129

• Manufacturer Part Number: atmega3250v-8auatmega325v-8ai
• Description: Atmega3250 8-bit Microcontroller With In-system Programmable Flash
• Manufacturer: ATMEL Corporation

18. 8-bit Timer/Counter2 with PWM and Asynchronous Operation
18.1
18.2
2570L–AVR–08/07
Features
Overview
Timer/Counter2 is a general purpose, single compare unit, 8-bit Timer/Counter module. The
main features are:
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A simplified block diagram of the 8-bit Timer/Counter is shown in
placement of I/O pins, refer to
isters, 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
Figure 18-1. 8-bit Timer/Counter Block Diagram
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
Status flags
Timer/Counter
TCNTn
OCRnx
=
“Register Description” on page
ASSRn
“Pinout ATmega3250/6450” on page
direction
count
clear
BOTTOM
Synchronized Status flags
= 0
Control Logic
=
TCCRnx
TOP
asynchronous mode
0xFF
ATmega325/3250/645/6450
select (ASn)
clk
Tn
Synchronization Unit
OCnx
(Int.Req.)
142.
Generation
Prescaler
Waveform
Figure
2. CPU accessible I/O Reg-
Oscillator
T/C
18-1. For the actual
OCnx
clk
TOVn
(Int.Req.)
clk
clk
ASY
I/O
I/O
TOSC1
TOSC2
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