ATMEGA48V_11 ATMEL [ATMEL Corporation], ATMEGA48V_11 Datasheet - Page 140

• Manufacturer Part Number: ATMEGA48V_11
• Description: 8-bit Atmel Microcontroller with 4/8/16K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

18. 8-bit Timer/Counter2 with PWM and asynchronous operation
18.1
18.2
2545T–AVR–05/11
Features
Overview
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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
I/O pins, refer to
including I/O bits and I/O pins, are shown in bold. The device-specific I/O Register and bit loca-
tions are listed in the
The PRTIM2 bit in
Timer/Counter2 module.
Figure 18-1. 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, OCF2A and OCF2B)
Allows clocking from external 32kHz watch crystal independent of the I/O clock
“Pinout Atmel ATmega48/88/168.” on page
“Minimizing power consumption” on page 41
“Register description” on page
Timer/counter
TCCRnA
OCRnA
TCNTn
OCRnB
=
=
Direction
Count
Clear
Control logic
TOP
=
TCCRnB
BOTTOM
Fixed
value
TOP
clk
153.
=
Tn
0
Figure
18-1. For the actual placement of
ATmega48/88/168
2. CPU accessible I/O Registers,
OCnA
(Int.req.)
OCnB
(Int.req.)
must be written to zero to enable
TOVn
(Int.req.)
Clock select
generation
generation
(From prescaler)
Waveform
Waveform
detector
Edge
OCnA
OCnB
Tn
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