AT90USB646-AUR Atmel, AT90USB646-AUR Datasheet - Page 59

• Manufacturer Part Number: AT90USB646-AUR
• Description: MCU AVR 64K FLASH 16MHZ 64TQFP
• Manufacturer: Atmel
• Series: AVR® 90USBr

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

8.4
7593K–AVR–11/09
External Reset
voltage invokes the delay counter, which determines how long the device is kept in RESET after
V
the detection level.
Figure 8-2.
Figure 8-3.
Note:
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see
Shorter pulses are not guaranteed to generate a reset. When the applied signal reaches the
Reset Threshold Voltage – V
the Time-out period – t
CC
rise. The RESET signal is activated again, without any delay, when V
INTERNAL
INTERNAL
TIME-OUT
TIME-OUT
RESET
RESET
If V
RESET
RESET
V
V
CC
CC
POR
MCU Start-up, RESET Tied to V
MCU Start-up, RESET Extended Externally
or V
V
V
CCRR
POR
POR
TOUT
parameter range can not be followed, an External Reset is required.
– has expired.
V
V
V
Table
POT
POT
RST
RST
t
– on its positive edge, the delay counter starts the MCU after
TOUT
8-1) will generate a reset, even if the clock is not running.
CC
V
RST
t
TOUT
AT90USB64/128
CC
decreases below
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