atmega32u4-16mu ATMEL Corporation, atmega32u4-16mu Datasheet - Page 49

• Manufacturer Part Number: atmega32u4-16mu
• Description: Atmega32u4 8-bit Avr Microcontroller With 32k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

8.0.4
7766A–AVR–03/08
External Reset
device is kept in RESET after V
when V
Figure 8-2.
Figure 8-3.
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
Figure 8-4.
INTERNAL
INTERNAL
TIME-OUT
TIME-OUT
CC
RESET
RESET
RESET
RESET
V
V
decreases below the detection level.
CC
CC
CC
MCU Start-up, RESET Tied to V
MCU Start-up, RESET Extended Externally
External Reset During Operation
V
V
POR
POR
TOUT
– has expired.
V
V
V
Table
POT
POT
RST
RST
CC
t
– on its positive edge, the delay counter starts the MCU after
TOUT
rise. The RESET signal is activated again, without any delay,
8-1) will generate a reset, even if the clock is not running.
CC
V
RST
t
TOUT
ATmega32U4
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