AT90USB1286-16MU ATMEL [ATMEL Corporation], AT90USB1286-16MU Datasheet - Page 59

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

8.0.3
7593A–AVR–02/06
Power-on Reset
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 reset from Power-on. Reaching the
Power-on Reset threshold voltage invokes the delay counter, which determines how long the
device is kept in RESET after V
when V
Symbol
V
V
t
RST
POT
RST
BODLEVEL [2..0]
CC
1. Values are guidelines only. Actual values are TBD.
2. The Power-on Reset will not work unless the supply voltage has been below V
decreases below the detection level.
Parameter
Power-on Reset Threshold
Voltage (rising)
Power-on Reset Threshold
Voltage (falling)
Minimum pulse width on RESET
Pin
RESET Pin Threshold Voltage
Table
Reset Logic
Reset Characteristics
Pull-up Resistor
8-1. The POR is activated whenever V
JTAG Reset
Register
FILTER
SPIKE
(2)
CC
CKSEL[3:0]
rise. The RESET signal is activated again, without any delay,
Power-on Reset
Reset Circuit
SUT[1:0]
(1)
Brown-out
Watchdog
Oscillator
Generator
Circuit
Clock
Condition
CK
Register (MCUSR)
MCU Status
DATA BUS
Delay Counters
CC
TBD
TBD
TBD
TBD
Min
is below the detection level. The
AT90USB64/128
TBD
TBD
TBD
TBD
Typ
TIMEOUT
Max
TBD
TBD
TBD
TBD
Units
POT
ns
V
V
V
(falling)
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