atmega103 ATMEL Corporation, atmega103 Datasheet - Page 28

• Manufacturer Part Number: atmega103
• Description: Atmega103 8-bit With 128k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

External Reset
28
ATmega103(L)
Figure 24. MCU Start-up, RESET Tied to V
Figure 25. MCU Start-up, RESET Controlled Externally
An external reset is generated by a low level on the RESET pin. Reset pulses longer
than 50 ns 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 (V
period t
Figure 26. External Reset during Operation
INTERNAL
INTERNAL
INTERNAL
TIME-OUT
TIME-OUT
TIME-OUT
RESET
RESET
RESET
RESET
RESET
RESET
VCC
VCC
VCC
TOUT
RST
has expired.
) on its positive edge, the delay timer starts the MCU after the Time-out
V
V
V
POT
POT
RST
V
RST
t
TOUT
t
TOUT
V
RST
CC
.
t
TOUT
0945I–AVR–02/07