ATmega64A datasheet(330/392 Pages) ATMEL

330 / 392 page

330

8160C–AVR–07/09

ATmega64A

Note:

1. Refer to “External Clock” on page 42 for details.

Note:

1. R should be in the range 3k

Ω - 100kΩ, and C should be at least 20 pF. The C values given in

the table includes pin capacitance. This will vary with package type.

2. The frequency will vary with package type and board layout.

28.5

System and Reset Characteristics

Notes:

1. The Power-on Reset will not work unless the supply voltage has been below VPOT (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 VCC = VBOT during the production test. This guar-

antees that a Brown-out Reset will occur before V

CC drops to a voltage where correct

operation of the microcontroller is no longer guaranteed.

Table 28-2.

External RC Oscillator, Typical Frequencies

R [k

Ω](1)

C [pF]

f(2)

31.5

650 kHz

6.5

2.0 MHz

Table 28-3.

Reset, Brown-out and internal Voltage reference Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Units

VPOT

Power-on Reset Threshold

Voltage (rising)

1.4

2.3

Power-on Reset Threshold

Voltage (falling)

(1)

1.3

2.3

VRST

RESET Pin Threshold

Voltage

0.2 V

0.85 V

tRST

Minimum pulse width on

RESET Pin

1.5

µs

VBOT

Brown-out Reset Threshold

Voltage(2)

BODLEVEL = 1

2.5

2.7

2.9

BODLEVEL = 0

3.6

4.0

4.2

tBOD

Minimum low voltage period

for Brown-out Detection

BODLEVEL = 1

µs

BODLEVEL = 0

µs

HYST

Brown-out Detector

hysteresis

120

VBG

Bandgap reference voltage

1.15

1.23

1.35

tBG

Bandgap reference start-up

time

µs

IBG

Bandgap reference current

consumption

µA

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