 English |
|
|
|
|
|
|
|
| AT90USB82_0811 Datasheet, PDF (48/306 Pages) ATMEL Corporation – 8-bit Microcontroller with 8/16K Bytes of ISP Flash and USB Controller | |||
| |||
| ◁ |
device is kept in RESET after VCC rise. The RESET signal is activated again, without any delay,
when VCC decreases below the detection level.
Figure 9-2. MCU Start-up, RESET Tied to VCC
VCC
VPOT
RESET
VRST
TIME-OUT
tTOUT
INTERNAL
RESET
Figure 9-3. MCU Start-up, RESET Extended Externally
VCC
VPOT
RESET
VRST
TIME-OUT
tTOUT
INTERNAL
RESET
9.4 External Reset
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see Table 9-1) will generate a reset, even if the clock is not running.
Shorter pulses are not guaranteed to generate a reset. When the applied signal reaches the
Reset Threshold Voltage â VRST â on its positive edge, the delay counter starts the MCU after
the Time-out period â tTOUT â has expired.
Figure 9-4. External Reset During Operation
CC
48 AT90USB82/162
7707EâAVRâ11/08
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese