Datasheet

22. 8-bit Timer/Counter2 with PWM and Asynchronous Operation
22.1 Features
• Single Channel 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 OCF2)
• Allows Clocking from External 32kHz Watch Crystal Independent of the I/O Clock
22.2 Overview
Timer/Counter2 is a general purpose, single channel, 8-bit Timer/Counter module. A simplified block
diagram of the 8-bit Timer/Counter is shown in the figure below. For the actual placement of I/O pins,
refer to Pin Configurations. 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.
Figure 22-1. 8-bit Timer/Counter Block Diagram
Timer/Counter
DATA BUS
=
TCNTn
Waveform
Generation
OCn
= 0
Control Logic
= 0xFF
TOPBOTTOM
count
clear
direction
TOVn
(Int. Req.)
OCn
(Int. Req.)
Synchronization Unit
OCRn
TCCRn
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
Related Links
AVR 8-Bit Microcontroller
8-bit Timer/Counter2 with PWM and Asynchronous Ope...
© 2017 Microchip Technology Inc.
Datasheet Complete
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