AT90USB647-MU Atmel, AT90USB647-MU Datasheet - Page 58

• Manufacturer Part Number: AT90USB647-MU
• Description: MCU, 8BIT, 64K FLASH, USB, 64QFN
• Manufacturer: Atmel

Specifications of AT90USB647-MU

• Controller Family/series: AT90
• No. Of I/o's: 48
• Eeprom Memory Size: 2KB
• Ram Memory Size: 4KB
• Cpu Speed: 16MHz
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 64KB
• Oscillator Type: External, Internal
• Package: 64QFN EP
• Device Core: AVR
• Family Name: AT90
• Maximum Speed: 20 MHz
• Ram Size: 4 KB
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 48
• Interface Type: SPI/TWI/USART/USB
• On-chip Adc: 8-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 4
• Lead Free Status / Rohs Status: Details

8.3
58
Power-on Reset
AT90USB64/128
Figure 8-1.
Table 8-1.
Notes:
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level
is defined in
POR circuit can be used to trigger the start-up Reset, as well as to detect a failure in supply
voltage.
A Power-on Reset (POR) circuit ensures that the device is properly reset from Power-on if Vcc
started from V
Symbol
V
V
V
V
t
CCRR
RST
POR
POT
RST
BODLEVEL [2..0]
1. The POR will not work unless the supply voltage has been below VPOT (falling)
Power-on Reset Threshold Voltage (rising)
Power-on Reset Threshold Voltage (falling)
V
Reset signal
V
Reset signal
Minimum pulse width on RESET Pin
RESET Pin Threshold Voltage
CC
CC
Table
Reset Logic
Reset Characteristics
POR
Start Voltage to ensure internal Power-on
Rise Rate to ensure internal Power_on
with a rise rate upper than V
Pull-up Resistor
8-1. The POR is activated whenever V
JTAG Reset
Register
FILTER
SPIKE
Parameter
CKSEL[3:0]
Power-on Reset
Reset Circuit
SUT[1:0]
Brown-out
Watchdog
Oscillator
Generator
Circuit
Clock
CK
CCRR
Register (MCUSR)
(1)
MCU Status
DATA BUS
. Reaching the Power-on Reset threshold
Delay Counters
Condition
5V, 25°C
CC
is below the detection level. The
Min
-0.1
Vcc
0.3
0.2
TIMEOUT
Typ
400
1.4
1.3
Max
0.85
Vcc
7593K–AVR–11/09
2.3
2.3
0.1
Units
V/ms
ns
V
V
V
V