AT90USB646-AUR Atmel, AT90USB646-AUR Datasheet - Page 170
AT90USB646-AUR
Manufacturer Part Number
AT90USB646-AUR
Description
MCU AVR 64K FLASH 16MHZ 64TQFP
Manufacturer
Atmel
Series
AVR® 90USBr
Datasheet
1.AT90USB646-MU.pdf
(461 pages)
Specifications of AT90USB646-AUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
EBI/EMI, I²C, SPI, UART/USART, USB, USB OTG
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
48
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Data Bus Width
8 bit
Data Ram Size
4 KB
Interface Type
SPI, UART
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
48
Number Of Timers
4
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 8 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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16. Output Compare Modulator (OCM1C0A)
16.1
16.2
170
Overview
Description
AT90USB64/128
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
calers” on page 98
149.
Figure 16-1. Output Compare Modulator, Block Diagram
When the modulator is enabled, the two output compare channels are modulated together as
shown in the block diagram
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 normal 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
includes part of the Timer/Counter units and the port B pin 7 output driver circuit.
Figure 16-2. Output Compare Modulator, Schematic
( From Waveform Generator )
( From Waveform Generator )
COMA01
COMA00
COM1C1
COM1C0
Timer/Counter 1
Timer/Counter 0
and
PORTB7
D
D
D
OC1C
OC0A
“8-bit Timer/Counter2 with PWM and Asynchronous Operation” on page
Q
Q
Q
(Figure
“Timer/Counter0, Timer/Counter1, and Timer/Counter3 Pres-
DATABUS
16-1).
OC1C
OC0A
Modulator
0
1
DDRB7
D
Q
1
0
Figure
OC0A / PB7
OC1C /
16-2. The schematic
Pin
7593K–AVR–11/09
Vcc
OC0A/ PB7
OC1C /
Pin
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