ATmega3290P datasheet(32/385 Pages) ATMEL

32 / 385 page

8021E–AVR–07/09

ATmega329P/3290P

When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in

Table 8-9 on page 32.

Note:

1. The device is shipped with this option selected

8.7

External Clock

To drive the device from an external clock source, XTAL1 should be driven as shown in Figure

8-3 on page 32. To run the device on an external clock, the CKSEL Fuses must be programmed

to “0000”.

Figure 8-3.

External Clock Drive Configuration

When this clock source is selected, start-up times are determined by the SUT Fuses as shown in

Table 8-11 on page 32.

Table 8-9.

Start-up times for the internal calibrated RC Oscillator clock selection

Power Conditions

Start-up Time from Power-

down and Power-save

Additional Delay from

Reset (V

CC = 5.0V)

SUT1..0

BOD enabled

6 CK

14CK

Fast rising power

6 CK

14CK + 4.1 ms

Slowly rising power

6 CK

14CK + 65 ms(1)

Reserved

Table 8-10.

Crystal Oscillator Clock Frequency

CKSEL3..0

Frequency Range

0000

0 - 16 MHz

Table 8-11.

Start-up Times for the External Clock Selection

SUT1..0

Start-up Time from Power-

down and Power-save

Additional Delay from

Reset (V

CC = 5.0V)

Recommended Usage

6 CK

14CK

BOD enabled

6 CK

14CK + 4.1 ms

Fast rising power

6 CK

14CK + 65 ms

Slowly rising power

Reserved

EXTERNAL

CLOCK

SIGNAL

XTAL2

XTAL1

GND

ATmega3290P Datasheet(PDF) 32 Page - ATMEL Corporation

ATmega3290P Datasheet(HTML) 32 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