Rainbow-electronics ATtiny28L Manual do Utilizador descarregar pdf (Página 14)

ATtiny28L/V

1062E–10/01

Figure 15. 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

Symbol Parameter Min Typ Max Unit

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

Table 5. ATtiny28 Clock Options and Start-up Time

CKSEL3..0 Clock Source Start-up Time at 2.7V

1111 External Crystal/Ceramic Resonator

(1)

1K CK

1110 External Crystal/Ceramic Resonator

(1)

4.2 ms + 1K CK

1101 External Crystal/Ceramic Resonator

(1)

67 ms + 1K CK

1100 External Crystal/Ceramic Resonator 16K CK

1011 External Crystal/Ceramic Resonator 4.2 ms + 16K CK

1010 External Crystal/Ceramic Resonator 67 ms + 16K CK

1001 External Low-frequency Crystal 67 ms + 1K CK

1000 External Low-frequency Crystal 67 ms + 32K CK

0111 External RC Oscillator 6 CK

0110 External RC Oscillator 4.2 ms + 6 CK

0101 External RC Oscillator 67 ms + 6 CK

Power-on

Reset Circuit

Watchdog

Timer

On-chip

RC Oscillator

VCC

RESET

100 - 500K

Delay Counters

CKSEL[3..0]

Full

INTERNAL RESET

COUNTER RESET

MCU Control and Status

PORF

EXTRF

WDRF

DATA BUS

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 74 75

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