Rainbow-electronics AT90LS4433 Manual do Utilizador descarregar pdf (Página 24)

24

AT90S/LS4433

1042G–AVR–09/02

Figure 25. MCU Start-up, RESET Tied to V

CC

Figure 26. MCU Start-up, RESET Controlled Externally

External Reset 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

RST

) on its positive edge, the delay timer starts the MCU after the Time-out

period (t

TOUT

) has expired.

Figure 27. External Reset during Operation

VCC

RESET

TIME-OUT

INTERNAL

RESET

t

TOUT

V

POT

V

RST

VCC

RESET

TIME-OUT

INTERNAL

RESET

t

TOUT

V

POT

V

RST

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