AT90USB1286-16MU ATMEL [ATMEL Corporation], AT90USB1286-16MU Datasheet - Page 150

• Manufacturer Part Number: AT90USB1286-16MU
• Description: Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
• Manufacturer: ATMEL [ATMEL Corporation]

15. 8-bit Timer/Counter2 with PWM and Asynchronous Operation
15.1
150
Overview
AT90USB64/128
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 15-1.. For the actual
placement of I/O pins, see
ing I/O bits and I/O pins, are shown in bold. The device-specific I/O Register and bit locations
are listed in the
The Power Reduction Timer/Counter2 bit, PRTIM2, in
page 55
Figure 15-1. 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 32 kHz Watch Crystal Independent of the I/O Clock
must be written to zero to enable Timer/Counter2 module.
Status flags
“8-bit Timer/Counter Register Description” on page
Timer/Counter
TCCRnA
OCRnA
TCNTn
OCRnB
=
=
“Pin Configurations” on page
Direction
Count
Clear
ASSRn
Synchronized Status flags
Control Logic
TOP
=
TCCRnB
asynchronous mode
Value
BOTTOM
Fixed
TOP
select (ASn)
clk
=
Tn
0
Prescaler
Synchronization Unit
“Power Reduction Register 0 - PRR0” on
OCnA
(Int.Req.)
OCnB
(Int.Req.)
Generation
Generation
3. CPU accessible I/O Registers, includ-
Waveform
Waveform
161.
TOVn
(Int.Req.)
OCnA
OCnB
Oscillator
T/C
clk
I/O
clk
clk
I/O
ASY
7593A–AVR–02/06
TOSC1
TOSC2