ATMEGA8L ATMEL [ATMEL Corporation], ATMEGA8L Datasheet - Page 102

• Manufacturer Part Number: ATMEGA8L
• Description: 8-bit AVR with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

8-bit Timer/Counter2
with PWM and
Asynchronous
Operation
Overview
102
ATmega8(L)
Timer/Counter2 is a general purpose, single channel, 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 Figure 45. For the
actual placement of I/O pins, refer to “Pin Configurations” 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 “8-bit Timer/Counter Register Description” on
page 115.
Figure 45. 8-bit Timer/Counter Block Diagram
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 32 kHz Watch Crystal Independent of the I/O Clock
Status Flags
Timer/Counter
TCNTn
OCRn
=
ASSRn
direction
count
clear
BOTTOM
Synchronized Status Flags
= 0
Control Logic
=
TCCRn
TOP
asynchronous Mode
0xFF
Select (ASn)
clk
Tn
Synchronization Unit
Prescaler
OCn
(Int. Req.)
Generation
Waveform
Oscillator
T/C
2486M–AVR–12/03
clk
clk
TOVn
(Int. Req.)
clk
OCn
ASY
I/O
I/O
TOSC1
TOSC2