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ATMEGA640 Datasheet(PDF) 174 Page - ATMEL Corporation

Part # ATMEGA640
Description  8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
PDF  449 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA640 Datasheet(HTML) 174 Page - ATMEL Corporation

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174
ATmega640/1280/1281/2560/2561
2549K–AVR–01/07
Output Compare
Modulator
(OCM1C0A)
Overview
The Output Compare Modulator (OCM) allows generation of waveforms modulated with
a carrier frequency. The modulator uses the outputs from the Output Compare Unit C of
the 16-bit Timer/Counter1 and the Output Compare Unit of the 8-bit Timer/Counter0. For
more details about these Timer/Counters see “Timer/Counter 0, 1, 3, 4, and 5 Prescaler”
on page 172 and “8-bit Timer/Counter2 with PWM and Asynchronous Operation” on
page 176.
Figure 63. Output Compare Modulator, Block Diagram
When the modulator is enabled, the two output compare channels are modulated
together as shown in the block diagram (Figure 63).
Description
The Output Compare unit 1C and Output Compare unit 2 shares the PB7 port pin for
output. The outputs of the Output Compare units (OC1C and OC0A) overrides the nor-
mal PORTB7 Register when one of them is enabled (i.e., when COMnx1:0 is not equal
to zero). When both OC1C and OC0A are enabled at the same time, the modulator is
automatically enabled.
The functional equivalent schematic of the modulator is shown on Figure 64. The sche-
matic includes part of the Timer/Counter units and the port B pin 7 output driver circuit.
Figure 64. Output Compare Modulator, Schematic
OC1C
Pin
OC1C /
OC0A / PB7
Timer/Counter 1
Timer/Counter 0
OC0A
PORTB7
DDRB7
DQ
DQ
Pin
COMA01
COMA00
DATABUS
OC1C /
OC0A/ PB7
COM1C1
COM1C0
Modulator
1
0
OC1C
DQ
OC0A
DQ
( From Waveform Generator )
( From Waveform Generator )
0
1
Vcc



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