Rainbow-electronics ATmega32L Manual de usuario descargar pdf (Pagina 35)

ATmega32(L)

2503C–AVR–10/02

Figure 15. Reset Logic

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

POT

(falling).

2. V

BOT

may be below nominal minimum operating voltage for some devices. For

devices where this is the case, the device is tested down to V

= V

BOT

during the

production test. This guarantees that a Brown-out Reset will occur before V

drops

to a voltage where correct operation of the microcontroller is no longer guaranteed.

The test is performed using BODLEVEL = 1 for ATmega32L and BODLEVEL = 0 for

ATmega32. BODLEVEL = 1 is not applicable for ATmega32.

Table 15. Reset Characteristics

Symbol Parameter Condition Min Typ Max Units

POT

Power-on Reset

Threshold Voltage (rising)

1.4 2.3 V

Power-on Reset

Threshold Voltage

(falling)

(1)

1.3 2.3 V

RST

RESET Pin Threshold

Voltage

0.2 V

0.85V

RST

Minimum pulse width on

RESET

50 ns

BOT

Brown-out Reset

Threshold Voltage

(2)

BODLEVEL = 1 2.5 2.7 3.2

BODLEVEL = 0 3.7 4.0 4.2

BOD

Minimum low voltage

period for Brown-out

Detection

BODLEVEL = 1 2 µs

BODLEVEL = 0 2 µs

HYST

Brown-out Detector

hysteresis

50 mV

MCU Control and Status

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]

Watchdog

Timer

Reset Circuit

Brown-out

Reset Circuit

Power-on

Reset Circuit

INTERNAL RESET

COUNTER RESET

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 312 313

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