Rainbow-electronics ATmega64C1 Manuel d'utilisateur télécharger pdf (Page 46)

100

101

7647A–AVR–02/08

ATmega32/64/M1/C1

Figure 7-2. MCU Start-up, RESET Tied to V

Figure 7-3. MCU Start-up, RESET Extended Externally

7.2.2 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 7-1) 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 – V

RST

– on its positive edge, the delay counter starts the MCU after

the Time-out period – t

TOUT

–

has expired.

Figure 7-4. External Reset During Operation

RESET

TIME-OUT

INTERNAL

RESET

TOU T

RST

CCRR

PORMIN

PORMAX

RESET

TIME-OUT

INTERNAL

RESET

TOUT

POT

RST

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 365 366

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Rainbow-electronics ATmega64C1 Manuel d'utilisateur Page 46

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