Rainbow-electronics AT90LS4433 Manual do Utilizador descarregar pdf (Página 22)

AT90S/LS4433

1042G–AVR–09/02

Figure 24. Reset Logic

Note: 1. The Power-on Reset will not work unless the supply voltage has been below V

POT

(falling).

Table 4. Reset Characteristics (V

=5.0V)

Symbol Parameter Min Typ Max Units

POT

(1)

Power-on Reset

Threshold

Voltage, rising

1.0 1.4 1.8 V

Power-on Reset

Threshold

Voltage, falling

0.4 0.6 0.8 V

RST

RESET Pin

Threshold

Voltage

0.6 V

BOT

Brown-out Reset

Threshold

Voltage

2.2

(BODLEVEL=1)

2.7

(BODLEVEL=1)

3.0

(BODLEVEL=1)

3.5

(BODLEVEL=0)

4.0

(BODLEVEL=0)

4.5

(BODLEVEL=0)

MCU Status

Brown-out

Reset Circuit

Power-on Reset

Circuit

BODEN

BODLEVEL

Delay Counters

CKSEL[2:0]

Full

WDRF

BORF

EXTRF

PORF

DATA B US

Reset Circuit

Watchdog

Timer

On-chip

RC Oscillator

Counter Reset

Internal Reset

RESET

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 124 125

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