Rainbow-electronics ATmega128L Uživatelský manuál stáhnout pdf (Strana 46)

100

101

ATmega128(L)

2467B–09/01

Figure 21. Reset Logic

Notes: 1. Values are guidelines only. Actual values are TBD.

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

POT

(falling)

Table 19. Reset Characteristics

(1)

Symbol Parameter Condition Min Typ Max Units

POT

Power-on Reset Threshold

Voltage (rising)

TBD TBD 2.3 V

Power-on Reset Threshold

Voltage (falling)

(2)

TBD TBD 2.3 V

RST

RESET Pin Threshold Voltage TBD TBD TBD V

RST

Minimum pulse width on

RESET

TBD TBD TBD ns

BOT

Brown-out Reset Threshold

Voltage

BODLEVEL = 1 TBD 2.7 TBD

BODLEVEL = 0 TBD 4.0 TBD

BOD

Minimum low voltage period for

Brown-out Detection

BODLEVEL = 1 TBD TBD TBD µs

BODLEVEL = 0 TBD TBD TBD µs

HYST

Brown-out Detector hysteresis TBD 50 TBD mV

MCU Control and Status

Brown-Out

Reset Circuit

BODEN

BODLEVEL

Delay Counters

CKSEL[3:0]

TIMEOUT

WDRF

BORF

EXTRF

PORF

DATA BUS

Clock

Generator

SPIKE

FILTER

Pull-up Resistor

JTRF

JTAG Reset

Watchdog

Oscillator

SUT[1:0]

COUNTER RESET

Watchdog

Timer

RESET

Pull-up Resistor

PEN

Reset Circuit

Power-On Reset

Circuit

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 330 331

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