at90ls4433 ATMEL Corporation, at90ls4433 Datasheet - Page 24

• Manufacturer Part Number: at90ls4433
• Description: At90s4433 8-bit Avr Microcontroller With 4k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

External Reset
24
AT90S/LS4433
Figure 25. MCU Start-up, RESET Tied to V
Figure 26. 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 27. External Reset during Operation
INTERNAL
INTERNAL
TIME-OUT
TIME-OUT
RESET
RESET
RESET
RESET
TOUT
VCC
VCC
RST
) has expired.
) on its positive edge, the delay timer starts the MCU after the Time-out
V
V
V
POT
POT
RST
t
TOUT
V
RST
CC
t
TOUT
1042H–AVR–04/03