ATmega64A datasheet(48/392 Pages) ATMEL

48 / 392 page

8160C–AVR–07/09

ATmega64A

Notes:

1. External Crystal or resonator selected as clock source.

2. If AS

0 bit in ASSR is set.

3. Only INT3:0 or level interrupt INT7:4.

9.7

Minimizing Power Consumption

There are several issues to consider when trying to minimize the power consumption in an AVR

controlled system. In general, sleep modes should be used as much as possible, and the sleep

mode should be selected so that as few as possible of the device’s functions are operating. All

functions not needed should be disabled. In particular, the following modules may need special

consideration when trying to achieve the lowest possible power consumption.

9.7.1

Analog to Digital Converter

If enabled, the ADC will be enabled in all sleep modes. To save power, the ADC should be dis-

abled before entering any sleep mode. When the ADC is turned off and on again, the next

conversion will be an extended conversion. Refer to “Analog to Digital Converter” on page 233

for details on ADC operation.

9.7.2

Analog Comparator

When entering Idle mode, the Analog Comparator should be disabled if not used. When entering

ADC Noise Reduction mode, the Analog Comparator should be disabled. In the other sleep

modes, the Analog Comparator is automatically disabled. However, if the Analog Comparator is

set up to use the internal voltage reference as input, the Analog Comparator should be disabled

in all sleep modes. Otherwise, the internal voltage reference will be enabled, independent of

sleep mode. Refer to “Analog Comparator” on page 230 for details on how to configure the Ana-

log Comparator.

9.7.3

Brown-out Detector

If the Brown-out Detector is not needed in the application, this module should be turned off. If the

Brown-out Detector is enabled by the BODEN Fuse, it will be enabled in all sleep modes, and

Table 9-1.

Active Clock Domains and Wake Up Sources in the Different Sleep Modes

Active Clock Domains

Oscillators

Wake Up Sources

Sleep

Mode

Idle

X(2)

ADC

Noise

Reduction

X(2)

X(3)

Power-

down

X(3)

Power-

save

X(2)

X(3)

XX(2)

Standby(1)

XX(3)

Extended

Standby(1)

X(2)

XX(2)

X(3)

XX(2)

ATmega64A Datasheet(PDF) 48 Page - ATMEL Corporation

ATmega64A Datasheet(HTML) 48 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL